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Line. 1 2, for Aphidise read Aphididse. 1 7, insert (,1 after (Davis). 1 8, insert (,) after Koch. 3 13, insert (;) at the last. 4 17, for Mrcrosiphini read Macrosiphini. 20 18, for " Cauda yellow " read " Cauda black." 2 L 8 from bottom, for Polysticum read Polystichum. 22 8 from bottom, for arthraxoni read arthraxonis. 29 8 from bottom, for forinosanus re?kd forinosana. 30 5 from bottom, omit subtribe at the last. 36 7, 8 and 11, for papuveri read papaveris. 39 4 ivora bottom, ior papaveri Tue-dA papaveris. 41 11 from bottom, for leonurii read leonuri. 46 9, for Callicaapa read CaUicarpa. 48 3 from bottom, for possitively read positively. 57 14, for oats read oat and grasses grass. 74 16, for colur read colours. 80 3, for auther read author. S3 11 and 13, for actinodaphni read actinodaplmis. Explanation of Plate IX, line 9, for Neocaprce read neocaprce. i ! APHIDIDAE OF FORMOSA.— L BY RYOICHI TAKAHASHI. if Entomological Assistant. INTRODUCTION. Among the more important insect pests of our economic plants in Formosa are those of the family Aphidiae or plant-lice. IMost of the species are of no economic importance, t)ut there are many wliich are well known pests of our cultivated crops. For example, Oregma lanigera (Zehntner) is a wide-spread pest, of considerable importance, of the sugar cane. The cabbage aphis, Rhopalosiphmn pscudobrassicae (Davis) and the cucumber aphis, Aphis niulvae Koch are regarded by native growers as extremely troublesome pests, although they are easily killed with an}' of the common contact insecticides. Aphis gossypii Qlov., Aphis medicaginis Koch, Toxoptera aurantii (Boyer). JTyzus persicae (Sulz.) and Pentalonia nigronervosa Coq. are also Well known pests in our island. These insects are kept well in check by theii- natural enemies, such as tlie ladj'bird-beetles, the syrphid flies, the lace-wings, the parasitic Hymenoptera, etc. (_)f the ladybird-beetles, pn^bably the most efficient in Formosa are Coccinella 7-punctata L., Synonycha grandis Thunb,, Ptychanatis a.dridis Pall, and Scymnus spp. ( )f the syrphid flies there are many species feeding on plant-lice in our island. Ghrysoixi formosae Mats, and Chrysopa boninensis Okam seem to be the most common aphid enemies among the lace-wings. 2 R. Takahashi Among the parasitic Hymenoptera there ;ire about five very coiiinion species in Formosa. Aphids present several unusual and remarkable peculiarities in their life-history and in recent years considerable attention has been paid to them in many parts of tlie world. A large amount of literature has resulted from this studj', but the group still requires a thorough investigation from several aspects. In the oriental region Prof, van der Goot and the late Mr. Das made considerable progress in the systematic study of these insects. The study of oriental Aphididae, however, is still quite in its infancj^ less than one hundred and thirty species having been described from Java, Ceylon, British India, Singapore and Hongkong and a con- siderable number of species probably remain to be discovered and worked up. From Formosa, Prof. Matsumura, Dr. Shiraki and Mr. Maki have recorded about twenty-five species. At present there are about one hundred species known to occur in the island, l)ut this number will be greatlj' increased as further studies are made. These studies on the Formosan Apliididae were carried outcliiefly at Taihoku under the direction of Dr. Shiraki, Chief of the Division of Entomology, and the present publication forms only a part . of the entire investigation. The results of further studies will be published later. The types of the new species dealt with in this paper are preserved in the collection of the entomological laboratory of lliis station. All the drawings accompanying this paper were made by the author. The author here wishes to express his sincere thanks to Dr. Shiraki for his kind and valuable help in conducting these investiga- tions. The author's most cordial thanks are (hie to the Hon. Dr. K. Aphiilidap of Formosa. — 1. 3 Oshima, .lirector of tlie Agricultural Experiment Station, Government of Formosa, for his kindness in publishing this paper. Thanks are also clue to tlie author's colleagues in this laboratory for their kind assistance during the progress of this study. The author must also render gi'ateful thanks to Dr. C. P. Alexander for kind counsel and advice. \ Family Aphididae. (1) Parthenogenetic females viviparous; sexual females oviparous. Subfamily Aphidinae. Parthenogenetic and sexual females always oviparous Subfamily (Jhermesinae. Subfamily Aphidinae. (1) Cornicles very elongate, provided with numerous long bristles or wingless females covered with many prominent elongate branched projections Tribe Trichosip/iina. Cornicles long or short, or sometimes absent, never provided with numerous long bristles; wingless females never covered with many prominent branched projections (2) (2) Last antennal joint with a distinct spur or terminal process, which is almost always as long as or longer than the base, if shortei'. the Cauda wart-shaped and the anal plate sinuated (3) Last antennal joint with a short spur (4) (.■)) Cornicles usually not very short; cauda not constricted at the base; anal plate not bilobed ... Tribe Aphidlna. Cornicles usually verj^ short; cauda often constricted at the base; anal plate often bilobed Tribe CalUpter inn. (4) Aleyrodiform Stages often developed; anal plate often sinuated; cauda often constricted at the base Tribe HormaphidiiKt. Aleyrodiform Stages not developed; anal plate not sinuated; cauda not constricted at the base. .., (■')) 4 R. Takaluishi. (.")). Antennal Sensoria often annular; winged form not provided with many hairs; cornicles very short or often absent Tribe Pemfliiglna. Antonnal sensoria circular or oval; winged form provided with many hairs; cornicles short, often situated on hairj' cones. Tribe Lochnina. Tribe Aphidina. Ke}' to suiitril)es. (1) Top of head forming a ledge which extends out over the antennae Subtribe Vesiculaphidini. Top of head not forming a ledge (2) (2) Head without prominent frontal tubercles... '^uhtrihe Aphidini. Head with prominent frontal tubercles (8) (3) Stigmatic vein strongly curved or more or less united with the upper branch of the 3rd oblique Sul)tribe Penlalanini. Stigmatic vein normal Subtribe il/rcros/p/w/tt. Subtrile Macrosiphini. (!) Cornicles cjdindrical or tapering, scarcely swollen (2) Cornicles swollen Aviphorophora^Vkcki. (2) Frontal tubercles with a prominent projection.... Phorodon Pass. Frontal tubercles without such a projection (•"!) (0) Frontal tubercles strongly convex on the inner side. ... J/ysw.s Pass. Frontal tubercles not strongly convex on the inner side (4) (4) Cornicles as long as or shorter than the Cauda 3IacrosiphonieUa Del Quel. Cornicles longer tlian the cauda Jlacrosip/nivi Puss. Key to species of Macrosiphum. (1) Wingless females provided witli numerous sensoria scattered over tile 3rd antennal joint (2) Aphididae of Formosa. — 1. g Wingless females provided witli about 1 to 10 seiisoria near the base of the 3rd antennal joint. ... , (3) (-?) General colour red 31. formosanum \\ . sp. General colour brownish black M. (/odonis Mats. (3) Cornicles very long and slender, reaching far beyond the caudal apex JI. neoariemisiae n. sp. If Cornicles not as long as above (4) (4) Cornicles almost not imbricated 31. paederiae n. sp. Cornicles distinctly imbricated (o) (5) Cornicles not at all reticulated 31. pis I (Kali.) Cornicles with at least the tips reticulated (tJ) ((')) Spur of the last antennal joint of the wingless viviparous female as long as or longer than the 3rd joint (7) Spur of the last antennal joint of the wingless viviparous female shorter than the 3rd joint 31. rosae (L.) (7) Cornicles almost reaching the caudal apex (8) Cornicles not reaching the caudal apex 31. alopectdl n. sp. (8) Spur of the last antennal joint nmch longer than the ord jtiint. 31. similacifoliae n . sp. Spur of the last antennal joint as long as the 3rd joint. 31. misccmt/d n. sp. 3facrosiphum gobonis Mats. Matsumura, Jour. Coll. Agr. Sapporo, vii, pt. (J, p. 395 (l'J17). 3Iaci-osiphum soUdaginis, Maki, Agr. Expt. St. Formosa, IjuU. 103, p. 11 (I'JKi). Hosts. — Arctium lappa, Clrsium Japonicum, Crepis japoiiica. Saussurea affinis. Distribution. — Formosa (Tailioku, Kagi, Shirin, Urai, Kiirun); Japan (Tokyo, Sapjioro). This aphis is one of the most common species in Japan and Formosa. Near Tokyo, tlie winged forms may be found almost It. TakahasVii. thidughout the year very coiiinioiily, winged males and wingless oviparous females sometimes occurring as late as December. ]n i^'ormosa the .species is very abundant from ])ecember to April and is quite I'are during tiie summer, and the sexual forms do not appear throughout the 3'ear. Jfacrosiphum (jigantcum Mats. (Trans. Sapporo Nat. Hist. See. vol. vii. pt. I. i>. '1. 1918) seems to Iju identical with this species, although its original description is too brief to decide tins positively. Macfoslphum formosamcm, n. sp. (PL. X. 2, figs. 5-8). Jfacrosighitm picridis, ^kl, Agr. Expt. St. Formosa, IJull. H>o, p. ii. (U) ](■.). Wingless viviparous female. Red. JNletathorax and the 1st and 2nd abdominal segments usuall}' l)lack. Eyes, antennae and cornicles black. Legs pale brown, apical halves of femora, apices of tibiae, and tarsi black. Cauda yellow. Body provided with a few stout capitate hairs; some hairs on the head similar, longer. Frontal tubercles large, not convex on the inner side. Antennae very long and slender, with a few capitate hairs; the 3rd joint provided with about 80 small, protruding circular sensoria scattered over the whole length ; the 4th joint somewhat imbricated, lacking sensoria; the relative length of joints as follows: 111-142, IV-36, V-35, VI-1()4 (12 + '.)2). Rostrum reaching beyond the middle legs. Cornicles cylindrical, long, about 1.5 times as long as the Cauda, not reaching the caudal apex, almost as long as half the 3rd antennal joint; slightly expanded towards the base, imbricated, distinctl}' reticulated on the distal one third. Cauda large, ensiform, provided with about 8 pairs of long lateral bristles. Legs very long and slender, covered will 1 many moderately long capitate liairs. Length of body — 3.0 mm. Antenna — 3.5 mm. Cornicle — 0.8 mm. Apbididae of FormoEa — I. 7 Winged viviparous female. I >ark red. Head and thorax blackish red. Eyes dark brown. Antciuiae and cornicles black. Abdomen dark red, except the basal halt (it the dorsnm and 'the underside black. Wings hyaline, stigma pale yellow, veins yellowish brown. Cauda yellow. Legs pale brown, apical halves of femora, apices of tibiae, and tarsi black. Body provided with some capitate hairs. Frontal tulicrcles large, shorter than tlie 1st antenna! joint. Antennae very long and slendei', with a few capitate hairs; the 3rd joint provided with about SO — !)(J small prominently protruding circular sensoria scattered over the whole length; the 4th joint sparcely imbricated, witliont sensoria; the relative length of joints as follows: III — 154, IV— 41, Y— 40, VI— 108 (];^ + 05). Rostrum reaching the middle coxae. Hind wings with 2 jDarallel obliques, booklets 3. Cornicles cj'lindrical, broadest at the base, somewhat tapering, long and slender, not reaching the caudal apex, imbricated, reticulated on the distal two fifths. Cauda large, ensiform, provided with 8 pairs of lateral bristles. Legs very long and slender, with many knobbed setae; the 2nd tarsus long and slender. Length of body — 2.2 mm. Antenna — 3.5 mm. Fore wing — 3.3 mm. Cornicle — 0.68 mm. Hosts. — iSonchus oleraceus ; Lactuca brivirostris ; Lactuca debilis, Lactuca formosana ; Lactuca scariola ; Lactvca gracilis. Distribution. — Formosa (Taihoku, Sliirin, Urai, Kiirun, Tansui, Sozan, Kagi, Kwanshirei); Japan (Tokyo). Related to 31. compositae Theob., but differs from it in the colour of the Cauda. The species is one of the most common aphids in Japan. Near Tokyo, the sexual forms make tlieir apperance in November, but in Formosa they do not occur throughout the j^ear. The winged forms are very common at aln^.ost all times in Formosa, as well as, in .lapan. Takabashi. Jffacrosiphum rosae (!>.) (PI. X. 1, Figs. G-S) Aph'is rosae, Linnnaeus, Sv.^t. Nat. i, 2, p. 7.}4 (ITijT): Fabricius, Syst. Rhyng. p. 298(1803): Kaltenbach, :\Ioii. PHaz. p. 3(1843). Siphonophora rosae, Koch Die PHaz. p. 178 (1857); Buckton, Mouog. Brit. Aphid, i, p. 1U3 (1875): Thomas, Bull. 2. Illinois St. Lab. Nat. Hist. p. 5(1878): Oestland, (^cuj. and Nat. Hist. f:;arvey of Minnesota, p. 24 (188G). Neclarophora rosae, Oestland, (Icol. and Nat. Hist. Survey of Minnesota, p. 81 (1887); Clark, Canad. Kntom. xxxv, p. 254(1903). Macrosiphum rosae, Fullaway, Ann. Rept. Hawaii Agric. Expt. St. for 1909, ]i. 25 (1910); Essig, Pom. .Tour. Ent. v, p. 550 (1911); Theobald, .lour. Econ. V-,\o\. viii, p. 55 (1913); Theobald, Bull. EnL Research, iv, p;. iv, p. 318(1914): van der Goot, Beitrage Kenntnis Holland. Blatti. p. 87 (1915); Matsumura, .Tour. Coll. Agr. Sapporo, vii, pt. 6, p. 361 (1917); van der Goot, Contrib. Fauna Indes Neerland. i, iii, p. 17 (1917); Essig and Kuwana, Proc. Calif. Acad. So. 4th S., viii, 3, p. 5] (1918); Swain, Ciiiv. Cahf. Pub. tech. Bull. Coll. Agr. Expt. St. iii. 1. p. ('.7 (1919). «tsiTU^i5 ^mnm^m,m^ (a^b) pi. 4.v. p. 31 utiEmi^) Hosts. — Rosa spp. Distribution. — Formosa ('raihoku,Kagi). Jajmn. Java (v.d. Goot); Ceylon (v.d. G. ) India ? (Lefroy) ; Hawaii (Fullaway) ; Australia (Froggatt); Ah'ica (Theobald); Europe; North America. Macrosiphum rosaej'ormls Das, to wliich J/, rosae (L.) is closely related, has never been collected in Formosa. Near Taihoku I have collected many j'ellow individuals of this species in Ma3\ Macrosiphum mi^canthi n. sp. (PI. 1,2, l''igs. (j-domen, nearly destitute of hairs. Head with a few short slightly knobbed hairs; frontal tubercles moderately conspicuous. Antennae with a few short hairs which are somewhat capitate; the 3rd joint not imbricated, with '1 or 3 small sensoria in a row near 10 . K. Takaliashi. the Imse; the 5th very slightly iinlii-ieated, the apical sensoria very small: the relative length of joints as follows: 111-50. IV-3], V-2iS. VI-GO (12 + 4.S). liostnuu nearly reaching the middle coxae. Prothorax with a small tubercle on each side, which is not pointed. Cornicles cylindrical, long and slender, not reaching the caudal apex; reticulated on their apical portion and expanded at their bases. Cauda ensiform, with o 'pairs of long bristles. Length of hodv — 2.0 mm. Antenna — 1.8 mm. Cornicle — 0.4 mm. Closely related to 31. miscanthi Tak., from which it is readily distinguished by the smaller body. Host. — Alopeculus sp. Collected by Mr. M. Maki. Distriliution. — Formosa (Taihoku). Macrosiphum pisi (Kalt.) Aphis pisi, Kaltenbach, .Mono. PHanz., p. 23(1843). Siphonophora pisi. Koch, Die Pflanz. , p. 190, pi. xxxv, figs. 261-262 (1857): Buckton. .Mun. Brit. Aphid, i, p. 134, pi. xiv (1S75): Thomas, Bull. 2, Illinois St. Lab. Nat. Hist. p. 8 (1878); Oestland, Geol. Nat. Hist. Survey Minnesota, p. 25 (1886). Nectarophora pisi, Oestland, Bull. 4, Geol. Nat. Hist. Survey Minnesota, p. 82 (1887): Sanderson, Canad. Ent. xxxiii, p. 31 (1901): Essig, Pomona .11. Kntom. ii, ]>. 33(; (1910). Nectarophora deslructor, Johnson, Canad. Ent. xxxii, p. 56 (1900). J/acrosiphum pisi. Sanborn, Ean.sis Univ. Sc. Bull, iii, No. 1, p. 79. pi. XV. fig. 80 (1904): Gillette, .h.ur. Ecoii. Entom. iv, p. 384 (r.Mlj: Theobald, .luur. Econ. Piol. viii, p. 134, fig. 43 (1913) and Bull. Em. liesearch, vi. p. 105(1915): Davis, U.S. Dept. Agr. Bull. 27(; (191.5): vanderOoot, Beitriige Kenntniss Holland. Blatll. p. 85 (P915); Maki, Agr. Expi. St. Formosa, Bull. 103 (1916): van der Goot, r,.ntrib. Fauna hides Neerland. i, iii, p. 15(1917): Matsu- Aphididap of Fovinosa.— I. 21 mura, Jour. Coll. Agr. Sapporo, vii. pt. G, p. 301 (VJ17): Das, Memoirs Ind. lAIus. vi, 4, p. 157. pi. xv, figs. 1-3 (1918); Swain, Univ. Calif. Pub. tech. Bull. Coll. Agr. Agr. Expt. St. iii. 1. p. 66 (1919). Acj/rthosiphum pisL Mordwiiko, Faune Russie Ins. Heniipt, i. p. 83 (1914). Hosts. — Pisum spp. Distribution. — Formosa (Taihoku); Japan. Java (v. d. G.); India (Das); Africa (Theobald): Europe; North America. Ifacrosiphum paederiue n. sp. (PL. II, '1, Figs. ]-">). Wingless viviparous female. Yellowish red. Head blackish brown. Eyes black. Antennae pale lirown witli apices of the 3rd, 4th and the 5t]i joints, and the 6th, black. Cornicles black. Cauda lirown. Legs pale brown; apices of femora and tibiae, and tarsi black. Body oval, l)roadest between the cornicles, with a few ver}- short capitate hairs on the dorsum and a few short bristles on the underside. Head with many moderately long capitate hairs. Frontal tubercles conspicuous, on the inner side ' distincth' convex. Antennae very long; with a few very short capitate hairs; the 3rd joint near tlie base with a small sensoria; the 5th slightly imbricated, the apical sensoria \erv small; the relative length of joints as follows: III-73, IV-56, V-53. VI-111 (16 + 95). Rostruni reaching beyond the middle coxae. Cornicles long and slender, reaching the caudal apex, almost without imbrication; narrowed near tlie apex, very slightly dilated at the middle and expanded at the base. Cauda large, with a few lateral bristles. Legs very long and slender, with numerous short hairs, most of which are somewliat knobbed. Length of body — 2.3 mm. Antenna — 3.2 mm. Cornicle — 0.7 mm. 12 '>'■ Tiikahashi. Host . — Paederia tomentosa . Distriljution. — Formosa (Taihoku, Kagi, Sliirin); Japan (Tokio). JIacrosiphum 'tmilacifollac n. sp. Wingless viviparous female. Head yellowish l)ro\vu, slightly dusky. Eyes dark red. Antennae and cornicles black. Thorax yellowish brown, dusky on the dorsum. Abdomen shining, brownish black on the dorsum with a pale yellowish patch at the base of the cornicle and at the middle of the dorsum between the cornicles; greenish on the underside. Cauda yellow. Legs yellowish brown, distal halves of femora, apices of tibiae, and tarsi black. Body not elongated, with some very short, slightly knobbed hairs. Head with a few rather short capitate hairs. Frontal tubercles shorter than the 2nd antennal joint. Antennae long and slender; the 1st joint much larger than the 2nd; the 3rd joint with a rather small sensoria near the base and some short stout hairs; the 4th joint somewhat imbricated, lacking sensoria; the relative length of joints as follows: III-80, IV-66, V-o6, VI- 143 (23+120). Body lacking lateral tubercles. Rostrum reaching a little beyond the middle coxae. Cornicle.s somewhat imbricated, well reticulated on the apical one fifth, 1.5 times as long as the Cauda, reaching near the caudal apex, constricted near the apex, gradually broadened towards the base, broadest at the base, about 6 times as long as wide. Cauda ensiform, witli •■> or 4 pairs of lateral bristles. Legs long and slender, with some moderately long setae. Length of body — 2.0 nun. Antenna — 2.".) mm. Cornicle — 0. 03 mm. Host. — tSmilax chinensis, attacking the leaf. Distribution. — Formosa (Taihoku). Collected by Mr. Sueta. Aphididae of Formosa. — I. 13 Macrosiplmm iieoartemisiae n. sp. (PL. I, 1, Figs. 1-5 and PL. IX, 2, Figs. G-0). Wingless viviparous female. Green. E3'es dark brown. Antennae l:)lack with the base of the 3rd joint pale brown. Femora pale Iii'own with the apices black; tibiae and tarsi black. Cornicles black, green at the base. Cauda dark green. Body oval, rather wide, l>roadest at the middle of the abdomen, with some long liairs, some of wliich are knobbed. Frontal tubercles large, not gibbous on the inner side. Antennae verj' long, provided with some setae; the 3rd joint not imbricated, with 3-4 small sensoria in a row near the base; the 4th slightly imbricated, wanting sensoria; the relative length of joints as follows: III-51, IV-42, V-36, VI-69 (11 + 58). Rostrum reaching beyond the middle coxae. P>ody with no lateral tubercles. Cornicles slender and very long, extending far beyond the abdominal apex; scarcely imbricated; very shghth^ dilated on their apical portion and slightly expanded at the base. Cauda large and ensiform, with some lateral hairs. Legs very long and slender, furnished with many short setae. Length of body — 2.3 mm. Antenna — 2.3 mm. Cornicle — 1.2 mm. Winged viviparous female. Green. Eyes red. Antennae black, with the base of the 3rd joint green. Mesothorax brownish green. Femora green, at the apices black; tibiae and tarsi black. Cornicles blackish, paler at the base. Cauda green. Wings hyaline, with gray veins and stigma. Body with some slightly capitate hairs. Head with numerous hairs, mostly capitate. Frontal tubercles large. ■ Antennae with some bristles and capitate hairs; the 3rd joint with about 20 sensoria scattered about the middle part and very slightly imbricated; the 14 E. Takaliashi. relative length of joints as follows: III-60, IV-55, V-52, VI-96 (20 + 76). Rostrum reaching to the middle legs. Cornicles as in tlie wingless form. Cauda slender, with about 8 pairs of long lateral bristles. Legs long, furnished with numerous moderately long bristles. The 2nd and 3rd obliques nearly parallel; the fork of the 3rd extending to the wing apex; hind wings with 2 (il)liques not parallel; booklets 5. Length of body — 1.7 mm Antenna — 2.0 mm. Cornicle — 1.0 mm. Fore wing — 2.3 mm. Width of lore wing — 0.9 mm. Host. — Artemisia capillaris. Distribution. — Formosa (Taihoku, Shirin). The wingless and winged viviparous females are found almost always throughout the year near Taihoku. Key to species of Ifacrosiphoniella. (\) General colour green M. tanacetarium (Koch.) General colour black or brownish red (2) (2) Wingless viviparous females with one sensoria near the l>ase of the 3rd antemial joint M. citricola v- d- Good. Wingless viviparous females with about 5-8 sensoria on the 3rd antenna] joint. M. formosartemisiac n. ^p. Wingless viviparous females with about 20 sensoria on the 3rd anten nal joint ; M. sanbonii (Gillette). ifacrosiphoniella citricola van der Goot. (PL. IIL 1). Coutrib. Fauna Indes Neerlandaises, i, IIL p. 31(1917). Host. — Cinnamomum sp. ; Lasianthus sp. Distribution. — Formosa (Taihoku, Urai, Toyen); Java (v. d. G.); Singapore (v. d. G.). Collected by the late Mr. L Nitobe on Cinnamomum sp. Hitherto unrecorded from Formosa. AphiJidae of Formosa. — I. 15 Macrosiphoniella formosartemlsiae u. sp. (PL. I, 1, Figs. ()-y). Wingless viviparous female. Sliining black. Eyes, cornicles and cauda black. Antennae black, except the base of the 3rd joint which is pale l>rown. Legs black with the bases of femora pale l)rown. • Body oval, broadest at the middle of the abdomen, with some moderately long stout hairs. Frontal tubercles very large, with numerous stout hairs, but no capitate ones. Antennae with some moderately long capitate hairs; the 1st joint much larger than the 2nd; the ord witli 5-8 small round sensoria in a row near the base, the 4th slightly imbricated, without sensoria; the relative length of joints as follows: III-45, IV-37, V-35, VI-67 (12 + 55). Rostrum reaching the base of middle coxae. Prothorax and abdomen without lateral tubercles. Cornicles imbricated, broadest near the base, slightly constricted at the base, tapering on the apical portion, and reticulated on the distal one third. Cauda as long as or a little longer than the cornicle, ensiform, with some long bristles. Legs very slender, with numerous stout knobbed hairs; the 2nd tarsal joint nearly 6 times as long as the 1st. Length of body — 2.2 mm. Antenna— 2.5 mm. Cornicle — 0.5 mm. Winged viviparous female. Black. Abdomen greenish black. Antennae black, except the 3rd joint which is pale brown. Eyes blackish brown. Cornicles and cauda black. Wings hyaline, with pale 3'ellow stigma and pale brown veins. Legs black, except the base of tlie fenuir which is pale brown. Body with some stout hairs. Frontal tubercles well develojied and straight on the inner .side. Antennae slender, with some moderately long stout hairs; the 3rd joint not imbricated, with about 8 sensoria; the 4th slightly imbricated, without sensoria; the relative length of joints as follows: 111-53, IV-39, V-39, VI-85 (20+65). 1(5 K. Takahashi. Rostrum ifiicliing beyoiul the middle coxae. Cornicles stout, not reaching the caudal apex, slightly expanded on the basal half, imbricated, and reticulated on the distal half. The 3rd olilique of fore wings nearly extending to the wing apex; hind wings with 2 oliliques nearly parallel; booklets o. Cauda a little shorter than the cornicle, furnished with about 6 pairs of lateral bristles. Legs long and slender, with, many ratlier long bristles; tarsus imbricated. Length of body — 1.5 mm. Antenna — L6 mm. Cornicle — 0. 3 m m . Fore wi ng — L 75 m m . Host. — Artemisia capillar is. Distribution. — Formosa (Taihoku, Giran, Kagi, Ako). This new species may be distinguished from 31. artemisiae (Pass.) hy tlie colour of the body. The winged form is not I'are. The sexual forms do not appear through the year near Taihoku. Tliis species and ITacrosiphum neoartemisiae Tak. are sometimes found together on the host plant. Macrosip/ioniclla sanborni (Gillette). llacrosiphum chri/santhemi, Sanborn, Kansas Univ. Science Bull. iii, i. p. 73. pi. xvii. fig. 85 (1904). llacrosiphum sanborni, Gillette, Canad. Ent. L, p. 65 (1908); Fullaway, Ann. Kept. Hawaii Agr. Expt. St. for 1909, p. 2G (1910); Gillette, .loui-. Econ. Entom., iv, p. 385 (1911): Das, Mem. Ind. Mus. vi, 4. p. U;.3, pi. xi (1918). Macrosqjhoniclla chrysanthemi, Del Guercio, Redia, vii. p. 332, fig. 30 (I'.ni); Theobald, Bull. Ent. Research, vi, pt. 2, p. 112 (1915). Macrosiphoniella bedfordi, Theobald, ]>ull. Ent. Res., iv, p. 318, fig. 4 (1914). Aphididae of Formosa. — I. jy Macrosiphoniella sanhorni. van der Qoot, Contiili. Fauna Ind. Neerland. i, iii, p. 36 (1917). i& sgT}?ip ^mnmm mm^ (m^t) pi. ta, figs. 1-2, p. 32 Hosts. — Chi'i/santhemuvi spp. Distribution.— Formosa (Taihoku); Japan (Tokyo). India (Das); Java (v. d. G.); Hawaii (Fullawaj'); Africa (Theobald); Europe, North America. Macrosiphoniella tanacetarium (Koch). (PL. IX, 2, Figs. 1-5). Siphonophora tanacetai'ium, Koch, Die Pflanzl. p. 187, figs. 257-258 (1.S57). JIacrosiphum tanacetarium, van der Qoot, Beitrage Kenntnis. Hulland. Blattl. p. 95 (1915). Host. — Artemisia vulgaris. Distribution. — Formosa (Taihoku Urai); Europe. Hitherto unrecorded from Formosa. Key to species of Ifyzus. (1) Cornicles provided with some prominent hairs 3f. polygoniformosanus w. sp. — Cornicles not provided with hairs (2) ( ■!) General colour green M. pei-sicae (Sulz.) — General colour dark brown 31. arthraxoni t\. sp. — General colour white or pale yellow (3) — General colour 3'ellow or orange (4) (3) Body of the wingless viviparous female with many prominent capitate hairs 31. formosartemisiae n. sp. — Body of the wingless \ivi]jarous female without prominent hairs. 31. hemerocaUis n. sp. (4) Cornicles reaching the caudal apex. ... 31. woodwardiae n. sp. — (.'ornicles not reaching the caudal apex. 31. polypodiacicola n. sp. J 8 R- Takahashi. Jfyzus polygoniformosanus n. sp. (PL. Xl\', 1, Figs. 1-3). Wingless viviparous female. Yellowish bruwn. Y^ye?, red. Antennae pale hrowii. apex of the 5th joint, and the 6th black. Cornicles yellowish brown. Cauda yellow. Legs pale brown; apices of tibiae, and tarsi black. Body broad, with a few very small capitate hairs. lieatl with some capitate and normal liairs. Frontal tubercles large, with a small blunt tubercle on the inner side. The 1st antennal joint much longer than the frontal tubercle, with a few short capitate hairs and a small l)lunt tul)ercle on the inner side; the 3rd joint iml>ricated, nearly without hairs, lacking sensoria; the 5th joint with a small apical sensoria; the relative length of joints as follows: III-53, IV-33, V-30. VI-89 (15 + 74). Eyes small. Rostrum reaching beyond the middle coxae. Abdomen with a small lateral tubercle on the 7th segment. Cornicles reac ling beyond the caudal apes, dilated at the base, slightly swollen near the apex, with many long, prominent capitate hairs mostly on the basal half. Cau(hi large, much longer than wide, somewhat constricted at the base, gradually narrowed towards the apex where it is rounded, with 5 pairs of long lateral bristles. Anal plate with many long normal bristles. Legs long and slender, witii many normal and capitate hairs. Length of body — l.S mm. Antenna — 1.5 mm. Cornicle — 0.4 nnn. Host. — Polygonum perfolialus ; Lonicera japonica. Distribution. — Formosa (Taihoku, Kagi). Collected by Mr. E. Kurosawa. Tiie species described above is distinct from all the species of Myzus known to ine by the prominent capitate hairs on the cornicles. AphidiJae of Formosa. — I. 19 Jlyzus pcrsicae (Sulz.) Ap/i!s persicae, Suize, Konn. Ins. p. 105(17(31). Aphis dlanfhi, Kaltenbach, Mon. Pflanz. p. 42 (1843). Rhopalosiphum dianthi, Koch, Die Pflanz. p. 42 (1857); Sanborn, Kansas Univ. Sc. Bull, iii, No 1, p. 6r., pi. ix, flg. 55 (1904); Theobald, Rail. Entom. Research, iv, p. 320(1914). Myzus malvae, Oestland, Geol. Nat. Hist. Survey Minnesota, p. 31 (1886). Rhopalosiphum per-sicac, Matsumura, ,Jour. Coll. Agr. Sapporo, vii, pt 6, p. 362 (1917); Kuwana and Essig, Proc. Calif. Acad. Sc. 4th S., viii, 3, p. 04 (1918); Swain, Univ. Calif. Pub. Tech. Bull. Coll. Agr. Agr. Expt. St. iii. 1, p. s5 (1919). Myzus ■p<^rsiccw, Buckton, ?tIunog. Brit. Aphid, i. p. 178(1876); Thomas, Illinois St. Lab. Nat. Hist., p. 9 (1878); Taylor, .hair. Econ. Ent; i, p. 83 (1908); Gillette and Taylor, Bull. 133 and 134, Colorado Agr. Expt. St. (1908); Gillette, .Jour. Econ. Entom. i, pi. 8, p. 359 (1908); Fullaway, Ann. Rept. Agr. P^xpt. St. Hawaii p. 28 (1910); Gillette, Juur. Econ. Entom. iv, p. 381 (1911); Patch, Maine Agr. Expt. St. Bull. 233, p. 260 (1914); Maki, Agr. Expt. St. Formosa, Bull. 103 (1916); Das, Memoirs Ind. Mus. vi, p. 166, pi. xviii, figs. 5-12 (1918). Myzo'ules persicae, van der Goot, Tijdschrift Entom. p. 84 (1913), Beitrage Kenntnis Holland Blattl., p. 170 (1915) and Contrib. Fauna Ind. Neerland., i, iii, p. 48 (1917). m*#- mmmmm^mn'^ (a^t) m/\m. p. i u (:^ie-^} Hosts. — Durranta s]}.; Capsella sp.; Raphanus sativtis ; Brassica. ; Papaver somnlferum ; Solarium, melongena ; Pisum sativum ; Chenopodiuvi album ; Ipomaea batata>^ ; Prunus persica ; Stellaria aquatica ; Acer sp.; Ghrysanthemun sp.; Nlcotlana tabacum ; Lactuca oldhami ; Psidium guyava. 20 E- Takahashi. Distribution. — Fonnosa (Tailioku, Kagi, Taiclivu). Japan (Tokio, 8aj>poro). Java (v. d. G.); India (Das); Hawaii (Fullaway); Africa (Theobald); Europe; North America. Dr. Sliiraki collected numerous winged viviparous females in the islands of Boko near Formosa in April 1920. The species is one of the most injurious pests in our island. lli/zus woodwardlai' n. sp. (PL. II. 1. Figs. G-U). Wingless viviparous female. Orange yellow or yellow, with many minute grey spots on the dorsum. Antennae pale brown, apical halves of the 3rd, 4th and 5th joints and the (Jth l)lack. Legs pale brown, excepting the distal half of femur, apex of tibia, and tarsi black. Cauda yellow. Cornicles black. Body oval, broadest at the middle of the abdomen, with many long capitate hairs. Eyes large. Frontal tubercles large, the inner side distinctly convex. Antennae with some setae and short capitate hairs; the 3rd joint lacking sensoria; the 4th sHghtly imbricated; the 5th with a very small apical sensoria; the relative length of joints as follows: III-85, IV-66, V-5], VI-90 (13 + 77). Rostrum short, reaching the base of the middle legs. Body without lateral tubercles. Cornicles cylindrical, imbricated, very long, reaching the caudal apex, broadest at the base, reticulated on the apical area. Cauda very small, narrowed at the base and broadened at the middle, with a few short hairs. Legs very long and slender, with numerous moderatelj- long setae. Length of body — 3.0 mm. Antenna — o.nmm. Cornicle — 1.0 mm. Winged viviparous female. Very beautiful. Head, antennae, mesothorax, cornicles and Cauda black. Eves dark brown. Pronotum blackish. Aphididae of Formosa. — I. 21 AlKlumeii orange yellow, with some small black spots on the basal lialf of tiie dorsum, 4 black bands on the hind half, 4 ratlier large black patches on eacli side in front of the cornicle and one large black patch behind tlie base of the cornicle. Femora mostly Idack, witli the bases brownish: tibiae dark brown, with tiie apices black; tarsi black. Stigma and veins gray. Body with many prominent capitate hairs. Frontal tubercles conspicuous, much shorter than the 1st antennal joint, with the inner side moderately convex. Antennae very long and slender, with some moderately long cajaitate hairs; the 1st Joint much larger than the 2nd, with some capitate hairs; the 3rd joint with 20-23 circular sensoria of rather small size almost in one I'ow over the whole length; the 4th joint imbricated, with 12 sensoria of mostly small size in one row over the whole length; the oth joint witli an apical sensoria; the relative length of joints as follows: IlI-lOO, IV-84, V-85, VI-115 (15+100). Rostrum slender, reaching the hind legs. Cornicles very long and slender, reaching far beyond the caudal apex, a little shorter than the 3rd antennal joint, cylindrical, broadest at the base, very slightly tapering, imbricated, reticulated on the apical area. Wing-veins normal; hind wings with 2 parallel obliques: hook- lets 5. Legs very long and slender, with many stout setae, some of which are slightly knobbed. Cauda small, broadened at the basal half, longer than wide, with 3 pairs of long lateral hairs. Length of Ixjdy — 2.7 nnn. Antenna — 3.7 mm. Fore wing — 4.5 mm. Cornicle — O.S mm. Hosts.- — Woodwardia spp.; Polydicum sp. Distribution. — Formosa (Taihoku, Kwannonzan). This plant louse is rather i-are near Taihoku, the winged form occurring only in the winter. . Jli/zus poli/podiaclcola n. sp. (PL. H, 1. Figs. 1-5). Wingless viviparous female. Yellow. Eyes, cornicles and cauda black. The 3rd antennal joint yellowish brown, with the apex black; the 4th and the following 22 E. Takahashi. joint:^ black. Legs pale hrowii: apices of feniom and tibiae, as well as tarsi, lilack. Body oval, broadest opposite midlength of the abdomen, furnished with a few short capitate hairs. Head with a few capitate hairs Avhich are a little longer than those on the abdomen. Frontal tubercles prominent, with the inner side somewhat convex. Antennae very long, imbricated, with some short capitate hairs; the ord joint lacking sensoria; apical sensoria of the 5th joint verj^ small; the relative length of joints as follows: III-82, lV-64, V-44, ¥1-121(15+106). Rostrum stout, reaching the middle coxae. Body lacking lateral tubercles. Cornicles long, imbricated, not reaching the caudal apex, broadest" at the base, reticulated on the apical area. Cauda very small, with a few long hairs. Legs very long and slender, with some short somewhat knobbed setae. Length of Ijody — 2.0 mm. Antenna — 2.5 mm. Cornicle — 0.45 mm. Host. — A plant of the Polypodlaceae. Distributiun. — Formosa (Taihoku). This new aphis appears to be rather rare, since I have collected only four wingless viviparous females in Taihoku during the season of 1920. Myzus arthraxoni n. sp. Wingless viviparous female. bhining dark brown. Head yellowish brown. Eyes dark red. The 1st and 2nd antennal joints pale yellow; the 3rd joint mostly pale yellow, with the apex black; the 4th and 5th joints black; the 6th joint black, with the spur sometimes pale yellow. Cornicles pale yellow, witii tiie bases and apices dusky. Cauda yellow. Legs pale brown, apices of tibiae, and the tar.si pale dusky. Apliididae of Foruiofa. — I. 23 Body oval, not strongly convex, without hairs. Head lacking hairs. Frontal tul)ercles very short, much shorter than the 2nd antennal joint, on the inner side moderately convex. Antennae long and slender, somewhat imbricated, lacking hairs; the 1st joint very large, much larger than the 2nd, somewhat convex on the inner side; the :ird joint lacking sensoria; the 5tli joint with a very small apical sensoria; the relative length of joints as follows: Ill-3ri, 1Y-2C), V-22. VI-60 (11+52). Rostrum very stout, not reaching tlie middle legs. Body lacking lateral tubercles. Cornicles cylindrical, slender, reaching near the caudal apex, slightly imbricated, broadest at the base, somewhat taj)ej'ing. without a reticulation. Cauda much shorter than the cornicle, much longer than wide, gradually tapering, with a slight constriction about tlie middle. Legs long and slender, witli some short setae: tarsi normal. Length of body — 1.6 mm. Antenna — L7 mm. Cornicle — 0.3 mm. Winged viviparous female. Head blackish. Eyes, antennae, thorax and cornicles black Abdomen yellow, with some small black spots and patches on the dorsum of the basal segments, 4 large black patches on the side and a very large black patch between the cornicles. Stigma gray; wings along the veins narrowly clouded with fuscous. Cauda yellow. Legs pale brown; apices of femora and til)iae, and tarsi black. Head witli a few very short stout hairs. Frontal tubercles very short, somewhat convex on the inner side. Antennae long and slender, imbricated, without hairs; the 1st joint very large, much larger than the 2nd, somewhat convex on the inner side; the 3rd joint with about liS very small circular sensoria scattered over the whole length; the 4t]i joint with 2 or 3 very small sensoria at the middle: the 5th joint with a very small apical sensoria; the relative length of joints as follows: in-44, IV-31, V-25, VI-6] (11 + 50). 24 K> Takabashi. Rostrum very short, reaching a little- heyond the front legs. Wings with the stigmatic vein somewhat strongly curved; subcosta with about 4 circular sensoria; the 1st oblique almost straight, the :>rd oblique twice forked, the upper branch not united with the stigmatic vein, reaching the wing apex; hind wings with 2 almost parallel obliques; booklets 2. Cornicles cj'lindrical, slender, not reaching the cauda, imbricated, about 5 times as long as wide at tlie base, broadest at the base, very slightly tapering. Cauda longer than wide, as long as half the cornicle, broadest at the base, tapering, slightly constricted aliout the middle, with 3 pairs of lateral bristles. Length of body — 1. 7 miii. Antenna — 1.7 nnu. Fore wing — ■2.5 mm. Cornicle — 0.2nin). Host. — Arthtaxon ciUarlf. Distribution. — Formosa ('iaihoku). Collected iiy Mr. F. Kurosawa. Myzus hemerocullis n. sp. Wingless viviparous female. I'ale yelU)wish green or white. Eyes black. Antennae pale green, with the last joint du^ky. Cornicles pale green, at the ai)ex very slightly dusky. Cauda pale green. Legs pale green, tarsi dusky. Body oval, .ilinost lacking hairs. l""rontal tubercles short, but very strongly convex (Ui the inner side. Antennae rather stout, imbricated, without hairs: the 1st joint a littK' larger than the 2nd, somewhat angulated on the inner -;ide: the ord joint lacking sensoria; the relative length of joints as follows: lIl-2'.», IN'-Kl. V-i:l. VJ-42 (l2 + .jO). IJostrum reaching a little l)eyon(l the uiidiile legs. Cornicles imbricated, somewhat dilated at the base, very slightly swollen on the distal half, as long as the last antennal joint, 4.5 times as long as wide, longer than twice the cauda, reaching the cautlal apex. Cauda | times as long as wide, a little longer than the hind Aphididae of Formosa. —I. 25 tarsi, with 2 very slight constrictions, provided with 2 pairs of lateral hnstle.«. Legs ratlier stout, with some moderately long setae. Length of body — 1.5 mm. Antenna — 0. So nun. Cornicle — O.o.") mm. Winged viviparous female. Pale yellowish green. Iilyes black. Head and antennae black. Mesothorax blackish. Cornicles pale brown. Legs pale brown, apices of tibiae and tarsi black. Cauda pale green. Wings hyaline; stigma pale gray; veins pale brown. Head with some very short stout hairs. Frontal tubercles as in the wingless form. Antennae imbi'icated, lacking hairs; the 3rd joint provided with 6-8 circular sensoria of median size in a row on the middle portion; tb.e 4th joint lacking sensoria; tlie relative length of joints as follows: 111-58, IV-30, V-20, VI-54 (11 +4:5). Rostrum reaching the middle coxae. Wings normal; the I'nd l)ranch of the 3rd oblique rather short; hind wings with 2 obliques; booklets 3. Cornicles almost as in the wingless form, a little shorter than the spur of the last antennal joint, about 4 times as long as wide. Body — 2. (J m m . Antenna — 1 . 4 nnn . Cornicle — 0.3 mm. Host. — HemerocalUs fulva. Distribution. — Formosa (Taihoku). Collected by Mr. T. Abe. Myzus fovmosartemlsiae n. sp. Wingless viviparous female. White. Eyes black. Antennae, cornicles, cauda and legs white; tarsi slightly dusky. Body elongate, soft, with numerous long capitate hairs. Head with 3 pairs of long capitate hairs arising from short tubercles between the frontal tubercles and 4 capitate hairs in a transverse row l>etween 26 K- Takahashi. the eyes. ILiirs on tlu- front lunger than others, as long as the 1st antenna] joint. l\yes rallier small, with small ocular tubercles. Frontal tubercles short, witli i capitate hairs on tlie inner side. Antennae very long and slender; the 1st joint larger than the 2nd, strongly angulated near the apex on the inner side, with 2 sliort capitate hairs which are shorter than those on the head; the 2nd joint with a few short capitate hairs; the 3rd joint lacking sensoria, with 2 very short capitate hairs; the 4th joint ver}^ slightl}^ imbricated, with or without a short capitate hair; the relative length of joints as follows: III-48. IV-34, V-39, VI- (12+96). Rostrum reaching the middle coxae. Cornicles cylindrical, very long and slender, reaching the caudal apex, almost as long as the 4th and 5th antennal joints taken together, somewhat imbricated, somewhat broadened at the base. Cauda stout, with 2 pairs of lateral bristles. Legs slender; tibiae provided with a few capitate and some normal hairs. Length of body — l.S mm. Antenna — 1.75 mm. Cornicle — 0.5 mm. Winged viviparous female. Pale yellow. Mesotliorax yellow. Antennae, cornicles, cauda and legs white. Wings hj-aline; stigma and veins pale. Bodj' with some very short capitate hairs. Frontal tul>ercles short, somewhat convex on the inner side. Antennae long and slender, with a few very short capitate hairs; the 1st ji)ini larger than llie 2ntl, angulated on tlie iiuier side; the 3rd joint somewhat imbricated, with about 10-12 circular sensoria not in a row almost over the whole length ; the 4th joint with 7 sensoria in a row over the whole length; the 5th joint with an apical sensoria; the relative length of joints as follows: 1I1-4C«, IV-12, V-38, VI- (1 1 +'.)!). Eyes not large, with very small ocular tubercles. Kostrum reaching the middle coxae. Wings normal: hind wings witli 2 j)arallel uliliques; booklets 3. Cornicles cylindrical, very kmg and slender. Aphididae of Formosa. — I. 27 reaching near tlie caudal apex, longer than the 3rd antennal joint, dightly broadened at the base. (^!auda stout, l)roadest at the base, tapering, without constrictions, with 2 pairs of stout lateral bristles. Legs very long and slender, tibiae provided with many setae, a few of which are knobbed. Length of bod}' — 1.7 mm. Antenna — 1.7 mm. Cornicle — 0.22 mm. Host. — Artemisia vulgaris, var indica. IHstribution. — Formosa (Tailioku). Collected by jNIr. Sueta. This new species is very closely related to Ckqiitojihorus chiy- santkeml Theob. from Africa, but differs from the latter in lacking a tul)ercle aliove the cauda of the wingless viviparous female. Phorodon huviuU (Sc\\ra.n\i). (PL. XIV, 1, Fig. 4). Aphis humuli, Schrank, Faun. Boic. ii, p. 110 (1801). Phorodon humuli, Buckton, Monog. Br. Aphid., i, p. 100(1875); Thomas, Nat. Hist. Illinois, Bull, ii, p. 9 (1878): Riley, Insect Life, p. 70 (1888); Remisch, Zeitschr. f. Insekt. Biol., p. 241 (1911); van per Goot, Holand. Blattl. p. 132 (1915); Matsumura, Jl. Coll. Agr. Sapporo, p. 302 (1917); Swain, Univ. California, Tech. Bull, iii, 3, p. 79 (1919). Phorodon cannabis, Das, Mem. Indian Mus. vi, p. 109 (1918). Host. — Hwmulus japonicuTn. Distribution. — Formosa (Taihoku); Japan (Tokio). India (Das); North America; Europe. Hitherto unrecorded from Formosa. Collected hj Mr. Kui'osawa in March 1921. Key to Formosan species of AmpJiorophora. (1) General colour orange, cornicles black. Winged females without sensoria on the 4th antennal joint. ... A. indicum (v. d. Goot). 28 K. Tak-iihashi. ( -re neral colour green, cornicles green. Winged females provided with alioLit 20 sensoria on the -Ith nnti'imal joint A. oleraceae (y. d. Qoot.) Aviphorophora oleraceac (v. d. Goot). llhopalosiphum oleraceac. v. d. Goot, Contril). Fauna Indes Neer- land. vol. 1, Fasc. iii, p. 40(1917). Hhopalosiphum lactucae. Maki, Dull. Agr. p]xpt. St. Formosa, No. 103, p. 22(1913). Hosts. — Lactuca debilis ; Sonchus sp. Distribution. — Formosa (Taihoku, Kannonzan): Java (v. d. < i.). Hitherto unrecorded from Japan. The Formosan specimens agree so well with the original descrip- tion that I have no hesitancy in so designating them. Amphorophora indwum (v. d. Goot.) Rhopalosiphum hidicum. v. d. Goot, Records of Indian Mus. xii, pt. i, No. 1, p. 1 (1916); Essig and Kuwana, Proc. California Acad. Sciences, 4th ser. vol. viii, No. 3, p. oo (1918). Rhopalouphum miniatum, Matsumura, Trans. Sapporo Nat. Hist. Soc. vol. vii, pt. i, p. 12(1918). Host. — unknown in Formosa. Distribution. — India (v. d. (root); Japan (Tokio. Hokkaido); Formosa (Arisan). Collected b^^ Messrs. Sonan and Yoshino in Oct. 1918. Hitherto unrecorded rrom Formosa. Near Tokio this plant louse is found on tiie twigs of Kuscaphis japonica and Staphylea bumalda. Ihe winged viviparous females appear only in the 2nd, 3rd and Itli generations. The males are winged or wingless and many immediates also occur. Aphididae of Poruiosa. — I. 29 Subtribe Pentalonini . (1) Stiginatic vein strongly curved Fvllwwayella litX Qu^r. Stigmatic vein fused with the upper brancli of the 3rd oblique, ... forming a closed cell Pentalonia Coq. Fullawayelki violae Pergande. Rhopalosiphum violae, Pergande, Canad. Ent. xxxii, p. 29(1900); Sanborn, Kansas Univ. Sc. Hull, iii. No. 1, p. 64(1904); Essig, Pum. •Tl. Ent. vol. i, p. 4 (1900): Davidson, Jl. Econ. Ent. ii, p. 303 (1909) and ibid, iii, p. i>77 (1910): Swain, Univ. Calif. Pub. Ent. iii, No. 1, p. 86 (1919). Neotoxoptera violae. Theobald, P>ull. Ent. Research, vi, pt. ii, p. 131 (1915). FvMawayella violae, Baker, Bull. Ent. Research, x, pt. 1. p. 46 (1919). Host. — Viola sp. Distribution. — Formosa (Taihoku). North America; Africa (Theobald). Hitherto unrecorded from Japan. A few wingless viviparous females have been collected bj' the author. In my opinion Phorodon violae Theobald from Africa (lUill. Ent. Research, p. 68, 1920) is closely related to this species. Fullawayella formosanus n. sp. (PL. iii, 2, Figs. 1-5). Winged viviparous female. Described from a specimen preserved in alcohol. Yellowish brown. Antennae, legs, cornicles and cauda pale lirown. Wings along the veins broadly clouded with fuscous, veins and stignui brown. Body oblong, with a few short hairs. Froutal tubercles con- spicuous, the inner sides prominently converging. Antennae with a 30 E- Takahasbi. few niimite hairs; the 3rd joint with al)out 35, tlie 4th 20, the r)th 6 circular sensoria scattered over tlie wliole length; the oth slightlj' imhi-icated. the apical sensoria very large; the relative length of joints as follows: III-92, IV-70, V-oH, VI-? (26+?). Stigmatic vein strongly curved; ohliques on the liind wing somewhat divergent; hooklets 5. Cornicles conspicuously dilated on the distal linlf. Cauda broad, rounded at the apex. Length of body — 2.0 mm. Antenna — ? Fore wing — 3.3 mm. Widtli of fore wing — 1.2 mm. Host. — Allium scorodoprasum, var viviparum. Collected by Messrs. M. Maki and J. Sonan. Distribution. — Formosa (Taihoku; To3'en). Pentalonia nigronervosa Coq. Coquerel, Ann. Fnt. Soc. France, vii, p. 279 (1859); Wilson, Jour. Kcun. Ent., ii, p. 340 (1909); Fullaway, Ann. Rept. Hawaii Agr. Exp. St. p. 29(1910); Baker, Bull. Ent. Research, p. 45(1919); Swain, I'niv. Calif. Pub., iii, p. 78 (1919). #*#- mmnmmmm^ c»^b) no. s, p. 127 ozie-^) i&m-nim ^m^m^'mm^ cmt) no. 1, p. 34, pi. 7 a, fig. 324 (izJEm^) Hosts. — 3Iusa sp>p. Distribution. — Formosa; Hawaii (Fullaway); North America. The species is very common in Taihoku anil the winged vivij^arous females are found at almost all times. Subtribe Vesiculaphldlni new subtribe. VesiculaphU caricis (Fullaway). (PL. iv, 1 and PL. x, 1, Fig. 5). Toxopiera caricis, Fullaway, Ann. Rept. Hawaii Agr. Expt. St. for 1009, p. 32 (1910). Vesiculaphis caricis. Del Guercio, Redia, v. 7, p. 404 (191 1\ Aphididae of Formosa. — I. 31 Described from specimens preserved in alcohol. Wingless viviparous female. Yellow. Antennae, cornicles, Cauda and legs concolourous with the body. Eyes dark red. Body elongated and somewhat flattened, without prominent hairs. Head large and flat, peculiar in shape, the top forming a ledge wliich extends out over the antennae; a very small blunt tubercle present in front of the eyes. Antennae very short, without hairs, arising from the underside of the head, 5-jointed; the 3rd joint lacking sensoria; the relative length of joints as follows: in-2], IV-7, V-20 (9+11). Eyes small; ocular tubercles distinct, but very small. Rostrum short, not reaching the middle coxae. Head and prothorax very distinctly defined. Prothorax nearly as long as the head, without lateral tubercles. Abdomen broadest at midlength, without tul)ercles. Cornicles projecting horizontal!}' behind, reaching the caudal apex. Cauda triangular, when seen from above, slightly curved upwards and furnished with a few i-ather short hairs. Anal plate large, reaching the caudal apex, semicircular, the posterior margin rounded. Legs short, witli a few setae. Length of body — LTmm. Antenna — 0.5 mm. Winged viviparou'^ female. Antennae, cornicles, cauda and legs yellowish brown. Head dark brown. Mesothorax black; abdomen yellowish brown. Wings hyaline, stigma and veins pale yellow. Body elongate, without hairs. Eyes large, with prominent ocular tubercles. Frontal tubercles very short. Antennae without hairs; arising from the underside of the head; the 1st joint much larger than the 2nd; the 3rd with 35, the 4th 15, the 5th 6 large sensoria on the whole length; secondary sensoria shghtly narrowed transversely; the relative length of joints as follows: III-47, IV-25, V-23, VI-52 (19 + 33). Rostrum not reaching the middle coxae. Body without lateral tubercles. Obliques on the hind 82 R. Takahashi. wings nearly parallel; booklets o: the ;5r(l oblique on the fore wing only once forked. Cornicles long and slender, reacliing the cauda. somewhat dilated near tlie apex, somewhat imbricated. Cauda wedge-shaped, not i^harply pointed, projecting a little beyond the anal plate, provided witli 2 pairs of rather short fine liairs. Anal plate similar to that uf the wingless female. Legs slender, moderately long; with a few setae. Length of body — 1.7 mm. Antenna — l.i'min. Cornicle — 0.3 mm. Fore wing — 2.55 mm. Width of fore wing — 1. 15 n)m. Host. — Cypervs rotundus. Collected by Mr. M. Maki. Distribution. — Formosa (Taihoku). Hawaii (Fullaway). The specimens described above slightly differs from Fullaway' s specimens in having more sensoria on the antennae. Subtribe Aphidini. (1) . Cornicles very short, alnuist wilier than long. (9) Cornicles not very short, longer tlian wide (2) (2) Cornicles swollen, not cylindrical (3) Cornicles scarcely swollen, cylindrical or tapering (7) (3) Abdomen above the cauda with a projection. Cnvariella Del Ouer. Abdomen above the cauda without a projection ( 4 ) (4) Antennae 5-jointed Yamataphis ^^aXs. Antennae 6-joinled (5) (5) Cornicles longer than the Cauda L' hoj^loslphum Koch. Cornicles as long as or shorter than the cauda ( (J ) (6) Cauda short and abruptly conical Brevicoryne Das. Cauda long, not abruptly conical Nyalopterus Koch. (7) The 3rd oblique once forked. .... Toxoptera Koch. The 3rd oblique twice forked ( 'S ) Aphidkiao of Porui.isa. — I. 33 (S ) Cauda abruptly conical Anuraphis Del Guer. — Cauda not abruptly conical Aphis L. ('•-)) Cornicles somewhat swollen Br achycolus Buckt. — Cornicles not swollen B rack i/slphotiiella n.g. Key to Formosan species of Rhopalosiphum. (1 ) The 4th antennal joint with no or 1-2 sensoria. R. nymphaeae (L.) The 4th antennal joint with G-10 sensoria ( 2 ) (2) Rostrum reaching the middle coxae (3) Rostrum not reaching the middle caxae. ... B. papaveri n. sp. (o) Wingless viviparous females with some ver}' short capitate hairs. B. lahoi'ensis (Das.) Wingless viviparous females without capitate hairs B. pseudobrassicae (Davis.) Rhopalosiphum pseudobrassicae (Davis.) Aphis pseudobrassicae, Davis, Canad. Ent., xlvi, p. 231 (l'J14); Maki, Agr. Exp. St. Formosa, Bull. 103(1917); Swain, Univ. Calif. Pub. tech. Bull. Coll. Agr. Expt. St. vol. 3. No. L p. 122(1019). Siphocoryne pseudobrassicae. van der Qoot, Contrilj. Fauna Lid. Neerland. i, iii, p. 64(1917); Theobald, Bull. Entom. Research, viii, p. 289 (1918). Siphocoryne indobrassicae. Das, Memoirs Ind. ]Mus., vi, p. 188 (1918). Hosts. — Baphanus; Brassica spp; Banunculus sceleratus ; Capsella bursa-pastoris. Distribution. — Formosa (Taihoku): Japan. Java (v.d.G.); India (Das); Africa (Theobald, Davis); North America. Dr. Shiraki collected some winged and wingless females in the islands of Boko, Formosa, in April 1920. Bhopalosiphum nymphaeae (L.) Aphis nymphaeae, Linnaeus, Syst. Nat., ii, p. 714(1767), and Fn. Suec, p. 983 (1789); Kaltenbach, Mono. Pflanz., p. 104(1843). 34 i;. Takahashi. Aphis plaiitarum nquaticu7n, Fabricius, Eiit. ISyst., iv, p. 214 (17'.»4). Aphis (ujuuticd. Jackson, Oh id Naturalist, viii, p. 248 (1907). njiojxdosiphnm iijiinpltnejtr. Koch, Die Pflanz. , p. 44, fig. ")7 (liS-"')7); Buckton, Mono. P.rit. Apliiil.. ii, p. 12. pi. xli (1877); Cockerell, 8i-ii'ii<'c. x.xii. p. 7(J4 (r.MI.")); Davis, Kutom. News, xxi, p. 24r)(l!)l()); Theobald, Kiilomologist, xliv. p. 18 (I'Jl 1); Patch, Maine Agi'. ivxpt. St. Hull. 202, p. 171 (11)12), und Science, xlii. No. 1074, p. 1(*.4 (191.")); Davidson, Jo ui'. Eeou. Kntoni. x, p. :5r)0 (1917); Essig and Kuwana, Proc. Calir. Ac. 8c. 4tli series, viii. :'., p. (12(1918). Siphocoryne luimphneat. Theobald, Uull. Knt. Res., vi. p. \\^ (I'.ii:.): Das, Mem. Ind. Mus.. vi. ]). IDl (191S): Matsuniura. .Tour. Coil. Agr. Sapporo vii. j)!. (",, p. ;;.")'.) (I'.I17): Swain, Tniv. Calif. l'ul>. Tech. lUiil. iii. i. p. i;;:; (1919). Siphonaphis ntimphaeac, van der Qoot, Kenntnis Holand. Blattl. p. 239(19].")). and Contril.. Fauna Ind. Neerlnnd.. i. iii. ].. 09(1917). Hosts. — Nymphaea sp ; Pi.^fia straiiotes; Primus communis; jSelumlo aucifera. 1 )irmosa. /'. nymphaeae, in Foi'inosa, lives on variou> aipiatie jilants tlu'ough the year and is very rarely found on Prunv^, although in the temperate country it is eonimon on various aquatic plants dui'ing the summer and spends the winter on Prunus sp. The species is viviparous through the year in Formosa. Rhopalosiphum pajtarrerl n. sp. (I'L. xiii, 1, tigs. 1-b) Descrihed from specimens preserved in alcohol. Wingless viviparous female. I )irty yellow. Eyes red. Antennae dirty yellow, with the distal half dusky. Cauda paler. Cornicles paler, dusk}- at the apices. Legs paler; apices of tihiae dark brown; tarsi black. Anal plate dusky. Aphididae of Formosa. — I. 35 Body Dval, rather wide; hroadet^t at midlength of tlie alidomen, witlu)Ut hairs. Head small and very short, with a few short slightly capitate hairs. Ej-es small; ocular tubercles small. Frontal tubercles short, with the inner side convex. Antennae short, imbricated, with- out hairs; the 3rd joint without sensorir; ajiical sensorie of the oth joint not large; the relative length of joints as follows: III — ~^9, lY — 28 \' — 25, VI — ■•38(17 + 41). Kostrum short, not reaching the middle coxae. Protliorax with a small lateral tubercle. Cornicles imbricated, a little longei' than the cauda, but not reaching the cauda, expanded at the l>ase and slightly dilated at the apex. Cauda wedge-shoped, longer than wide, with 3 pairs of very short lateral bristles. Legs slender, with some setae. Length of body — 2.5 mm- .\ntenna — 1.4 mm. Cornicle — 0.35 mm. Winged viviparous female. Antennae, eyes and mesothorax black. Abdomen dirty yellow, with many small grey patches and spots on the dorsum. Wings along the veins slightly fuscous clouded; stigma and veins grey. Femora black except the pale l>rown base, ti])iae pale brown, with the apices l)lack: tarsi black. Caude blackish, paler at the base. Cornicles pale l)lackish l)i'own. Body oblong, without hairs. Frontal tubercles very short, slightly convex on the inner side. Antennae shoit, imbricated, witliout hairs; the 3rd joint with about 30. the 4th 13, the 5th 1 sensoria irregularly scattered over the whole length ; the relative length of joints as follows: III— 52, IV— 33, V— 28, VI— 67 (20 + 47). Rostrum not reaching the middle coxae. The 3rd oblique of fore wings twice forked, the 1st fork extending to the wing apex, the 2nd short; hind wings with 2 obliques nearly parallel; booklets 3. Legs slender, with some moderately long setae; tarsi .slender and imbricated. Cornicles similar to those of the wingless females but shorter. Cauda shorter than the cornicle, expanded on the l)asal half, with 2 pairs of ii'j K. T^ikahashi. lateral in'istles. Lengili uf bull}- — 2. mm. Antenna — 1.4 mm. Fore Aving — 2.(i rum. Width of fore wing — l.Unim. Cornicle — about U. 23 mm. Host. — Papaver somnlferum, attacking the leaf. Distribution. — Formosa (Ako, Kagi). In Yovmoas. 31 ijzus jyerslcae {^vl\z.). RhojMlodphum papaveri u. sp. ; Yamataphls papaver i n. sp. and Aphis gossypli Glov. are found on Papaver som?iiferum, one of the most important cultivated plants in Formosa. Rhopalostpimm papaver i, sometimes occurs veiy abundantly on the leaves and stems. Rhopalosiphum lahorensh (Das.) Steplienosia lahorensis. Das, Memoirs Indian Mus. vi. 175 (li<],^). Host. — Artemisia vulgaris, var. indica ; Siegesbeckia m-ienUxlis f Distribution. — Formosa (Taihoku); India (Das). Collected by Mr. Sueta. Hitherto unrecorded from Formosa. The Formosan specimens exactly agree with Mr. Das' s description and figures. Key to Formosan sj)ecies of Cavariella. (1) Antennae 6-jointed CW/Zcfwe/o/a (Essig et Kuw.) Antennae 5-jointed (2) (2) Milk white C. araliae n.'i^\>. Green C. neocapraew. sp. Cavariella bicaudata (Essig et Kuw.) (PL. ix, 1, figs, l-'.l) Siphocoryne bicaudata, EssijJ and Kuw. Proc. Calif. Acad. Sc. 4th series, viii, No. 3, p. 64(1918). Host. — Saliz spp. Aphididae of Formosa. — I. " < Distribution. — Formosa (Tailioku); Japan (Tokio, Saitania). Hitherto uiirecordt'd from Formosa. Cavai'iella araliae u. sp. (PL. xiii, 2, fig. 1) Wingle.ss viviparous female. Milk wliite. Eyes red. Antennae white, with tlie last joint slightly dusky. Legs white, witli t!ie tarsi slightly dusky. Cornicles and Cauda wliite. Body oval, witliout hairs. Front rounded. Eyes rather small; ocular tuhercles small. Frontal tubercles absent. Antennae short and slender, without hairs, 5-jointed; the 3rd joint without sensoria; the relative length of joints as follows : III— 35, IV— 11, V— 27 (10 + 17). Rostrum reaching be3'0ud the middle coxae. Body without lateral tubercles. Cornicles imbricated, slender, reaching a little beyond the caudal apex, somewhat dilated on the distal portion. Abdomen just above the cauda with a horn-like tubercle, which is a little shorter than the cornicle, reaching a little be}^ond the cornicle, Cauda wedge-shaped and broad, with 2 slight constrictions, and 2 pairs of lateral bristles present. Legs moderatel}' long, with some short setae; tarsi normal. Length of bodj- — 1,7 mm. Antenna — 0.7 nun. Cornicle — 0,3 mm. Host, — Aralia spinosa. Distribution — Formosa (Urai, Kwannonzan), Japan (Tokio) This aphis was collected by the author on the young leaves of the host in Januarjr and Fel;)ruarv 1921. Cavarietta tieocaprae n. sp, (PL, ix, 1. figs, 10-16). Winged viviparous female. Described from specimens preserved in alcohol. Head and mesothorax blackish brown. Abdomen yellowish brown, with the middle part of the dorsum dark. 3H R. Takahashi. Eyes (hiik Iimwi). L'ovnick's ami cauda ])ak' Inxiwn. Wings hyaline; veins and stigma pale lirown. Legs yelluwisli lu-owu: apices of til)iac dark. Body oblong, will unit hairs. Eyes large. Frontal tulicrcles very short. Antennae very short. •Vjointed, without hairs: the ord joint with ahout :>3 large sen.soria scattered over the whole length; the 4th imbricated, with a very large sensoria at the apex: the relative length of joints as follows : III— 41, IV— 13. V—:U (12+19). Ro.strum reaching beyond the middle legs. Body wanting lateral tubercles. Obliques on the hind wing parallel: liooklets 4. Cornicles dilated on their distal halves. Abdomen just ab(.)ve the cauda with a distinct horn, which is rounded and provided with a pair of short bi-istles at the apex. Cauda dilated at the liasal liall. witli 2 |)airs of lateral bristles. Legs long and thin, with some setae. Length of body — 2.3 mm. Antenna — l.t> mm. Cornicle — 0.27 mm. Fore wing — .'J. 1 mni. Width of fore wing — 1.2 mm. Host — tSalu sp. Collected by Mr. M. Maki. Distribution. — Formosa (Taihoku, Koheki). This species is easily distinguished from Cavariella caprae (Fal).) by the 5-jointed antennae, and Ijy the nuich longei' tubercle on the dorsal surface of abdomen. Brevicoryne brassicae (L.) Aphl!^ hrasskae, Linnaeus, Syst. Nat. i. 2. ]>. 734 (1767) and Fn. Suae. p. 985 (1789); Koch, Die Pfl., p. 14'.), tigs. 203—204(1857); Buckton, Brit. Aphid, ii, p. 33(1875); Thomas, Illinois St. Lab. Nat. Hist. Bull. 2, p. 12 (1878); Oestland, (leol. Nat. Hist. Survey Minne- sota, p. 44 (1886), and Gaol. Nat. Hist. Survey Minnesota, p. 57(1887); Sanborn, Kansas Univ. Sc, Bull. vol. iii. No. 1, p. 54, pi. x. fig. 61 (1904); Fullaway, Ann. Kept. Hawaii Agr. Expt. St. p. 40 (1910); Aphididae of Formosa. — I. 39 Essig, Pomona Jnor. Ent., iii, p. 523(1911); Herrick, Jour. Econ. Eat. iv. p. LMO(llill); Theobald, Bull. Eat. Res., iv, p. 32U(1914): Maki, Agr. Expt. St. Formosa, Hull. 103 (19 K')); Matsumura, Jour. Coll. Agr. Bappoi'o, vii, pt. 6, p. 356(1917); Essig and Kuwana, Proc. Calit. Acad. Sc, viii, 3, p. 68(191S); Swain, Univ. Calif. Pulj. iii, 1, p. 95(1919). iSipkocoryne bra>islcae, van der Goot, 'rijdsclirift vooi' Entoni. p. 93 (1913). Brevlconjne brasslcae, van der Goot, Beitriige Kenntnis HoUaad. Blattl. p. 246(1915); Das, .Menu. Ind. Mus. vi. p. 187(1918); Baker, U. S. Dept Agr. Bull. S2(;. \^. 45 (1920). m^m- Am^M^^^mm'^ c^^t) no. s. p. nu (:>cje-^) Hosts. — Brassica spp. Distribution. — -Formosa (Taihitku); Japan (Tokyo, Sapporo); India (Das and Lefroy); Hawaii (P^illway); Australia (Froggatt); Africa (riieobald); Europe; North America. I have never seen this species from Formosa. Yamataphis Mats. Body with some stout hairs. Eyes with prominent ocular tuber- cles. Frontal tubercles very short. Antennae 5-iointed; spur longer than the base; sensoria normal in shape. Fore wings with the 3rd oblique twice forked; hind wings with 2 obliques. Abdomen without dorsal tubercles. Cornicles much longer than the cauda, somewhat swollen. Cauda wedge-shaped. Tarsi normal. This genus may be distinguished from Brevicoryne Das h\ the 5-iointed antennae. Type — Ymnataphis oryzae Mats. Yamataphis papaveri n. sp. (PL. xiii, 2, figs. 4-6) Winged viviparous female. Black. Eyes and antennae black. Wings hyaline, veins dark brown, stigma blackish. Cornicles and cauda blackisli. Femora 40 K. Takahashi. black, tibiae brownish black. Body with some moderately long stout liaivs. Eyes large, ocular tubercles prominent. Frontal tubercles very short. Antennae very short and rather shout, 5-jointed, imbricated, with some moderately long stout iiairs; the ord joint with aliout l, p. 358(1918); Das, Aphididao of Formusa. — I. *^ Meinoir-i lad. Mus., vi, p. '11'^ (l^l*'^); Swain, California Univ. Pul>. tech. Bull. Coll. Agr. Agr. Expt. St. III. i. p. 130 (11)10). Hyalopierus arundinis, Koch, l>iu FHniiz. p. 21. f. 27-28(1857); Buckton, Mon. Br. Aphid, ii. p. 111. pi. LXXV. tigs. 4-5 (1877); Oestland, Geol. Nat. Hist. Survey, Minnesota, j.. 48(1887). Host. — Prunus sp; Phragmites sp. Distribution. — Formosa; Japan. Java (v. d. (i.): India (1 )a<): Atricn (Tiieohald); Europe; North Ameiica. Hitherto unrecorded from Formosa. The species, in the temperate country, feeds on Phragmites sp. and Prunus sp. during the summer ami is found only on Prunus sp). during the winter, hut in Formosa the aphis is found on Phragmites sp. and Pruiiux S2'>. through the year, without producing sexual lorr rms Key to Formosan species of Toxoptera (1) Winged viviparous females with S — 'J sensoria e]'cles very short, .\ntennae ind)ricated, without hairs: the ^Jrd joint with 8-9 circular sensoria of median and small size almost in one row; the 4th joint lacking sensoria: the rela- tive length of joints as follows: III— 29, IV— 22. V— 20. VI— 40 (lU + 30). llostrum reaching the middle coxae. Prothorax and the 1st ami 7th abdominal segments with a l)hnit. rather large tubercle on each side, of which those on the prothorax larger than those on the abdomen. Wings with the ord oblique once forke ) (0) Cornicles as long as the cauda. Si)ur almost as long as the ord jt)int A. droserae u. sp. I'oriiicles a little shorter tlian the cauda. Spur longer than the ;'>i^hirakii w. ^]}. PurpHsh or dirty yellow. Feeding on Miscanthiii^ A. miscunt/ii n. sp. (1 1) Wingless females densely covered with a white powder A. smilcKifoliae n. sp. Wingless females not covered with a white powder (12) (12) Winged females willi n-\0 sensoria on the 3rd antennal joint. (14) Winged females with l-")- 18 sensoria on the 3rd antennal joint. (13) (13) Spur of tlie last antennal joint longer than the 3rd ... A. tavalesl DelQuQr Spur a- long as the 3rd A. nimicisL. (14) The :'>rd antennal joint of the wingless vidiparous female longer Aphidklae of Porumsa. — I. 4 J- than or as long as the spur (15) The 3rfl antennal joint of the wingless vivipardus female shorier than the spur J. tiudrar Koch. (15) Wingless viviparous females :laik hrown or Mack A. medicaglnis Koch. Wingless viviparous females yellow, green or dark green. .. (Ui) (ifi) Rostrani of tlie winged female reaching the hind legs A. goKsyp.^ a Glo\e. Rostrum of the winged femaii/ not reaching the hind legs... (17) (17) Yellow or 3^ellowish green A. pom i De Qeer. Orange yellow or dark green A. suliceti Ka\t. Aphis gossypii Glove. Glover, Kept. Dept. Agr. U.S.A. jt. .'JG (1S7(;;); Pergande, Insect Life, vii. pp. :;09-315 (1895): Gillette, .Jl. P:eon. Ent., i. pp. 17(:;-],s] (1908); Fullaway, Ann. Repr. Hawaii Agr. Plxp. St. for 1909, jk 39 (1910); Theobald, Bull. Ent. Research, iv, p. 3l!1 (1914); Maki, .\gr. Exp. St. Formosa, I!ull. 103 (191G): Matsumura, Jl. Coll. Agr, Sapporo, vii. pt. G. p. 357 (1917); Das, Mem. Ind. Mus., vi, p. 219 (1918); Essig and Kuwaoa, Proc. Calif. Acad. Sc, 4th ser.. viii. No. 3, p. 68(1918); Swain, Univ. Calif. Puh. Tech. ser. Coll. Agr., Agr. Exp. St.. iii, i, p. 105 (1919); Paddock, Texas Agr. Expt. St. Bull 257 (1919) Hosts. — Bidens pilosa ; Ilibiscus rosa- sinensis ; Pirus serofina ; Acanthopanax acideatum ; Papaver so-mniferum ; Gnaphalium japoaicum- Distribution. — Formosa (Taihoku, Taichyu) ; Japan (Tokio ; Sappoio). India (Das & Lefroy); Ceylon (v. d. Goot); Hawaii (Fullaway); Africa (Theobald); Europe; North Ainerica ; Malay (Jab ore) Dr. Shiraki collected some females on Papaver at Kagi, Formosa, 46 R. Takahaslii ill Marcli 1918. Ap/iix (/osKi/pii Qlov. rar. callicarpae Ji. v. (PL. V. 1, fig?. 1-0 and PL. xii. 1, Fig? 1-8 Tliis variety differs from A. gosK.yjiii in tlie following points : (1) AI)doiiH'ii orange yelliiw. Head. ]iro- and niesotliorax and liind liair (>f the abdomen dark green. (2) The relative length of antenna! joints of the wingx'd viviparous female as [..Hows : 111—3^. IV— 20, V— 20. VI— .".C (14 + 42). H ost . — ( 'allicaapu formosana. Distrihntion. — Formosa (Taihoku). The winged form is very cum in on. Aphix malvae, Koch. (PL. xi. 2). AphUmalvae, Koch, Me Pflanz. p. 125. f]g^^. 169-170(1857); Das, Mem. Tn.l. Mus. vi. p. 21:5. pi. .xxv, figs. 9-16(1918). Aphis cucurbUi. Buckton, ^fonog. P>r. Aphid. H. jx 50. pi. Liv, figs. 1-2(1877). Aphis possypii van der Qoot, Cuntrih. l-'auna Ind. Xeerland. i. iii, ]). 9.'! (1917). Hosts. — Durrdnfd phinticri: Chroihiithon rrj/phi/Ilin)! ; Cvcumis satint: (.'olocasid sp. J.)istrihution. — Fonno.sa (4'aihoku): Japan (T(dvyo). India (l>as): Java (v.d.(T.); Europe. Ilithertu unreeordeil from Formosa. Aphis medica(/i/iis Koch. Aphis medicaginix, Koch, I'llanz.. |>. '.14. pi. xvii. figs. 125-126 (1857); Gillette, .lour. Econ. Fnt.. i. pp. 177-178(1908); Essig, Pom. Ooll Jour. Ent.. iii. p. 527 (1911): Theoblad, Hull. Ent. Research, vi, p. 12S ():M5): van der Goot, ('..ntrih. Faun. Ind. Neerland., i, iii, p. i)8(l917): Das, Mem. Ind. .Miis., vi, p. 203(19is); Essig and Kuwana, Apbulidae of Formoss. — I. 4( Proc. Calif. Acad Sc, 4th S., viii, 3, pp. 71-72 (] 9 18); Swain, Univ. Calif Pul). iii, p. 114 (1919). Aphis nimlcis, Maki, Agr. Expt. St. Fonno^a. Bull. 103^(1916). Hosts — Pisum spp.; Wikstroemia indlca; Aeschynomena indica. Disti'ibution. — Fniiimiia (Taihoku) : Japan (Tokyo, Sapporo) ; ^lalav (Jahure); Java (v. <1. (4.); Ceyl. 7;!4,-")and 7o6(]~*'>~): Buckton, Mon. Brit. Aphid., ii, p. S5. pi. Ixiv (1S77); Thomas, Illinois St. Lab. Nat. Hist., Bnll. 2. p. 13(]S7.s):Oestland,(;eol. Nat. Hist. Survey, Minnesota, p. 01 (18S7): Gillette, -b .ur. Econ. Ent.. lii, p. 40C. (1910): Patch, Maine Agr. Expt. St.. Bull. 202, p, 177(1912); Theobald, I'.ull. Ent. Res., iv, p. 329 (1914), and ( anad. Ent. p. 234 (]91(;): van der Qoot, Keimtnis Holland. I5lattl.. p. 220(1910); Matsumura, Jour. Coll. Agr. Sai)poro, vii, pt. ().. p. 357 (li)bS); Das, .Mrm. Ind. Mus., vi. p. 203(1918); Essig and Kuwana, Proc. Calif. Acad. Sc, 4th s., viii, p. 73 (1918). Host. — Solan mil u Kjrairi . Distribution. — Formosa (Taihoku); .lapan (Tokyo, Sapporo); India (Das); Africa (Theobald); Europe, North America. A plant-ldusf dctei-mint'd by Mi-. M. Maki as Aphis nimicis L., does not l)elong to tliis species, but to A. medicaginis Kocli. Aphis salicefi Kalt. (PL. xiii. 1. tigs. 9-14) Aphis saliceti. KalUnbach, Monog. PH. p. 103 (1843); Koch, Die Pfl. p. lbs (1857); Buckton, Monog. Br. Aj)hid. vol. II. p. 52 (1S79); Van der Qoot, Beitriige zur Kenntnis der Holland. Blat lause, p. 225 (1915); Qillette and Bragg, Can. Ent. L, No, 3, p. 89 (1918). Siphonophora salicicola. Thomas, Bull. 2, III. St. Fal). Nat. Hist., p. 8 (1878). 48 H. Takahaehi. Ap/ile salicicola, Monell, Bull. ."i. U. S. Geo]. Surv., y. 24 (1870). Oestland, P.ul!. 4, Geul. Nat. Hist. Survt'y :\Iinm-..ta. p. 03 (1887); Davis, .T..nr. Kc<.n. Riitom. III. p. 490 (lino); Davidson, .Inur. Econ. Entoin. V. p 408 (1912); Patch, lUill. 21:5. :\raine Agr. Expt. St., p. 81 (1913). Aphis yanaf/icola. Matsumura, .Tl. Coll. .\gr. Sap])oro, vii. pt. (>, p. 390 (1917). Host. — Salix sp. Distribution. — Formosa (Tailioku) : Japan (Tokio, Papporo) ; Europe; Nortli America. Hitlierto unrecorded fron) Forinosa. In Formosa I have nevei' I'ouikI the sexual forms during the spring and summer. Aphis (araresi Del Guercio. Aphis tavaresi, Del Guercio, Broteria, vii. p. 143, pil. xvi. Figs. 1-2 (1908): Theobald, Bull. Ent. Research, iv. p. 323(1914); van der Goot, Contrih. Fauna. Ind. Neerland.. i. iii. p. 108(1917). Aphis citricola. van der Goot, MitteJ. Nat. Mus. 29, 2 Eieh. Jahrb. Hamh. Wissen. Aust 29, pp. 273-273(1012): Essig and Kuwana, Proc. Calif. .\cnd. Sc viii. p. 08 (1018). Myzvscitricidm. Shiraki, ;^^pt^i^#Sij^^ ^A§| (g;|t) p. 112 (:>c]Ez:^) Hosts. — Citrus spp. Distriluition. — Formosa (Toihoku): Japan (Essig and Kuwana); Java (v.d.C); Ceylon (v. d. (t.): Africa (Theohald) ; Europe (Del Guercio); Cliile (v.d.G.) JIi/zus cilricidiis Kirkaldy (Proc. Hawaii JCnt. Soc-, i, pt. 3, p. 100, 1907) seems to be identical with this species, although iiis original description is too brief to decide this possitively. Aphis povii De Geer. Aphis poiiii, De Geer, Mems. 111. p. .j3 (1773): Gillette, Jour. Aphididae of Formosa. — I. 49 Ecun. Entom. i, p. S&2 (1908); Theobald, Bull. Ent. Re^, iv, p. 323 (1914). :inrown, with the last 2 joints darker. Legs pale broAvn; apices of tibiae, and the tarsi black. Cornicles dark green. Cauda black, with the base green. Body oval, broade.st at the middle of the abdomen, furnished with a few long fine hairs and densely covered with a wliite powder. Eyes rather small. Frontal tubercles scarcely apparent. Antennae with some long fine hairs; the 1st joint much broader than the 2nd, the inner side convex; the .3rd without sensoria; the 4th slightly im- bricated; the relative length of joints as follows: III — 40, IV — 33, V — 32, VI — 56 (15 + 41). Rostrum short and stout, not reaching the middle legs. Prothorax and the 1st and 7th abdominal segments on 50 R. Takahashi. each side with a small lateral tuhercle which is not sharphy pointed. Cornicles stout, about 4 times as long as wide, broadest at the base and somewhat imbricated. Cauda very short, and at the apex rounded, with some long fine hairs. Legs rather long: hind legs very long and slender; with many long fine hairs. Length of body — 1.8 mm. Antenna — 1.8 mm. Cornicle — (».o mm. Winged viviparous female. Dark green. Wings hyaline, the 1st and 2nd obliques slightly clouded, stigma and veins blackisli brciwn. Body almost without Iiairs, l)ut provided with white secretions. Frontal tubercles conspicuous (see [>!. iv. 2, fig. 7). Eyes large; ocular tubercles very small, l)Ut prominent. Antennae \-ery slender, imbricated, with some short hairs; the 1st joint much larger than the 2nd; the 3rd with about 10 small sensoria in a row distributed almost throughout the whole length; the 4th lacking sensoria; the apical sensoria of the 5th very small; the relative length of joints is as follows: 111—40, IV— 29, V— 30. VI— ."7(17+40). Pn)thorax and the 1st and 7t]i al)dt)minal segments with a very small lateral tubercle. Wing-veins stout; the 2nd oblique slightly curved; "bliques on the hind wings parallel: booklets 2. Cornicles not reaching the caudal apex; broadest at the base, somewhat curved and minutely imbricated. Cauda short, broadest at the liase, hairy. Legs long and slender, with many hairs; tarsi very slender. Length of Body — 1.5 mm. Antenna — 1.7 mm. Cornicle — 0.23 mm. Host. — iSmilax china. Distribution. — Formosa, Japan (Tokio). Tlie winged viviparous females are rather common. Aphididae ef Formosa. — I. 51 Aphis droserae n. sp. (PL. xiv, 1, figs. 7-9). Wingless viviparous female. Greenish black. Head, eyes and cornicles black. Antennae black, at the bases paler. Cauda concolourous with the abdomen, with the paler base. Femora blackish brown; tibiae pale brown, with the apices black; tarsi black. Body oval, slightly pulverulent, without liairs. Head with a few short Ijristles. Frontal tubercles very short, somewhat convex on the inner side. Antennae in)bricated, with about 4 very short bristles; the 3rd joint lacking sensoria; apical sensoria of the 5th joint very small; tlie relative length of joints as follows: III— 22, IV— 14, V— 17, VI -SI (10 + 21). Rostrum stout, reaching almost the hind coxae. Prothorax and the 1st alKlominal segment with a small lateral tubercle which is not sharply pointed. Cornicles very short, as long as the cauda, not reacli- ing the cauda, about 4 times as long as wide at midlength, imbricated, broadest at the base and tapering. Cauda wath a distinct constriction about the middle, with 3 pairs of long lateral bristles. Legs slender, with some setae. Length of l)ody — 1.0 mm. Antenna — 0.7 mm. Winged viviparous female. Colour almost similar to the wingless form. Tliorax and antennae lilack. Wings with pale gray stigma and veins. Body lacking a powder. Antennae imbricated, without hairs; the 3rd joint with 6 circular sensoria in a row almost over the whole length; the 4th joint locking sensoria; the relative length of joints as follows : III — 18, IV — 12, V— 13, VI— 30 (9 + 21). Rostrum stout, reaching beyond the middle coxae. Wings normal; booklets 2. Host. — Drosera lourerii. Distrilrition. — Formosa (Sozan) This peculiar Aphis somewhat resairibles Aphis bambusae Fullaway, 52 K. Takahashi. hut differs t'runi the latter in the structure of the antennae, tlie colour (if the body, etc. Aphis droserae is found on the flower or the underside of the leaf of Di-osera lourell a well known insectivoj'ous plant in Japan. Aphis bambusae Fullaway. (PL. xii, 2, figs. 5-0) Aphis bambusae, FuUaway, Ann. Kept. Hawaii Agr. Expt. St. p. 35 (1910). Melanaphis. bambusae, van der Goot, ( 'ontril). Fauna Indes Neer- land. i, iii, p. 01 (11)17). Host. — Bambusa nana. Distribution. — Formosa (Tailioku). Hawaii (Fullaway); Java (v.d.G.); Singapore (v.d.G.); Hongkong (v.d.G.) Hitherto unrecorded from Japan. This species is rather rare near Taihoku and I have never collected the winged females. Aphis nasturtii Koch.? Die Pflanzenl. p. 136 (1857). Wingless viviparous female. Dark green, slightly covered with a white powder. Body oval, almost lacking liairs. Frt)ntal tubercles very sliort, somewhat convex on the inner side. Antennae 4 or 5-jointemni. Width of fore wing — U.bmm. Host. — 3Iiscanthus sp. * Distribution. — Formosa (Taihoku, Koshyun) The winged females are very raic and the >exiial forms have never l)een collected. Apliididau of Formusa. — I. 57 ] )r. Sliivaki collected a few winged and wingless females in Ma}^ \\)2] in Kosliyun. Apliis maiclls Fit'-.h. Aphis maidis, Fitch, Insects N. Y., vol. i. p. :^!8 (18.").-;): Oestland, Geol. Nat. Hist. Survey Minnesota, Bull 4. p. r^r, (l.ss 7): Sanborn, Kansas Univ. Sc. Bull. vol. Ill, No. 1, p. 58. pi. xi, fig. (J0(1'JU4); Davis, U. S. Dept. Agr. Bur. Enl. Tech. Ser., No. 12 (1909): FuUaway, Ann. Kept. Hawaii Agr. Expt. St.. p. 41 (1910): Patch, Maine Agr. Expt. St.. Bull. 202 (1912): Theobald, Bull. Ent. Kes., vi, p. 128 (191.".): Das, Mem. Ind. Mus. vi, p. 20S (191cS). Sijjhonaphis maidis, van der Qoot, ( 'ontrili. Faun. Ind. Neerland.. i, iii. p. Cm (1917). «*#- Mmmmmmm^ no. 8, p. 120 c;*:3ez:^) Hosts. — Wheat: oats; grasses. Distribution. — Formosa; Japan (Toki(.i). Java (v. d. G); India (Das); Hawaii (Fullaway): Africa (Theobald); North America. ApUs ficicola n. sp. (PL. iv, 2, figs. 13-17). Wingless viviparous female. Described from specimens preserved in alcohol. Body and antennae blackish brown. Eyes, coi'nicles and cauda l)lack. Legs black, except the basal half of femur and the middle part of tii)ia which are dark brown. Body wide, with some long fine hairs. Eyes rather small. Frontal tubercles very short. Antennae slout, provided witli many long fine liairs: the 3rd joint imbricated, lacking sensoria; the relative lengtli of joints as follows: III-30, IV-22, V-24, VI-3.3 (10 + 25). Rostrum reaching almost the middle coxae. Prothorax with a lateral tubercle. Abdomen with a few lateral olituse tubercles which are smaller than those on the prothorax. Cornicles \ery short, almost 58 K. Tiikiiliashi : twice as long as wide, broadest at the base, imbricated, and jirovided witli 2-i long bristles. Cauda large, wider and a little longer than the cornicle, provided wilb many long hairs. Legs long and stcait. providfil with many long tint' hairs. Length of liody — 1.('> mm. Antenna — LOnini. Host. — Ficus wlyhtiana. Distribution . — Formosa (Tai 1 1 oku). Aphis somei Essig et Kuw. (I'L. i, 2, tigs. 1 1-]S). Proc. Calif. Acad. Sc. 4tli Series, viii, No. 3, pp. 75-7U (lUiy). Hosts. — Rhus scmUdaia; Sapium sebiferum; Heptapleurum octo- phyllum; Viharnum formosamim; Bischoffia javanica; Pitto- sporum lohir. 97 (1913). Brachycaudus pruni. van der Good, 'I'ijds. voor Entom. \>. 97 (1913); Das, Memoirs Indian Mus. VI, p. 222 (1918). Anuraphis kelichrysi. Baker, Montldy Hull. l)ept. Agr. Calif, ix, Nos. 5-6, p. 203 (1920). Host. — Vernonia ch'mensis; Bothriospermtim tenellmn. Distribution. — Formosa (Taihoku. Tansui). C'ej'lon (v. d. G.): Indin (Pas): Java(v. d. (joot): Europe; North America. Hitlici-to uiuvcorded from Formosa. Brachycohis lieraculi i\. sp. (PL. xii. 1. tigs. 9-13). Wingless viviparous female. Gieen. Mead slightly dusky. Eyes l)laek. Antennae pale green, apex of the 5th joint, and the 6th dusky. Cornicles pale green, with dusky apices. Eegs pale green, apices of tihiae, and tarsi dusky. Cauda green. Hody oval, not elongated, lacking hairs, pulverulent. Frontal tubercles absent. Antenae short, imbricated, provided with a few very short hairs; the 3i(l joint lacking sensoria; the relative length of joints as follow-^: III-39. l\'-ll. V-11. ^'l-36 (1 1 +25). IJostrum reaching the middle legs. liody lacking lateral tubercles. Cornicle.s very small, almost twice as long as wide, slightly swollen. Cauda large and stout, as long as the spur of the last antennal joint. broade.>t at the base, tapering, longer iIimu wide. 2.5 times as long as the cornicle, a little longer than the hiuli on the basal half. Legs iirownish, except distal halves of feiiinra. apices of tiln'ae, and tarsi b];ick. Kddy uval, not elongated, without hairs. Fruntal tubercles ab- sent. I\yes small. Antennae short, rather stout, imbricated, without hairs: the ord juint lacking sensuria; the relative length of joints as follows: lll-li), TV-16, V-li), \'l-;;c. (13 + 23). Rostrum stout, reaching the middle legs. Body without lateral tubercles. Cornicles very small, a little longei- than wicU'. broadest at the base, without constriction. Cauda very large and long, much longer than the hind tarsi, with a constriction about the middle, with many long hairs. Legs rather stout, with some short hairs. Length of I)ody — 1.4 nun. Antenna — 0.7.~>mm. I lost. — Leersia hexandra. Distribution. — Formosa (Taiboku. Tainan), Japan (Tokiu). 1 1 ii hei'to unrecorded from Formosa. Many wingless females are often completely submerged in the Avater on the blades of the host and apparently in no wise disturlied or Aphidiae of Foiuinsa. — I. 63 inconvenienced by this circumstance, but are to all appearances as comfortable as those above water. This aphis on account of the waxy powder covering the liody appears to be particularly adapted to a life in moist localities and to suffer no inconvenience from contact witli water when submerged. Tribe Tnchodphhut. Key to subtribes. (1) Wingless females with many elongate, branched projections. ^uhtrihe Cervaphidinl. Wingless females without bi'ant-bed pi'djections Subtribe TrichosiphinL Subtribe Trichosiphini. (1) Antennae G-jointed Greenidea Schout. Antennae 5-jointed U utrichosiphum Essig et Kuw. Key to Formosan species of Greenidea. \A'i!igless viviparous female. (1) .3rd antennal joint longer than spur ( •"> ) ord antennal joint shorter than spur (2) (2) Dark lirown or yellowish brown. Cornicles rather stout, not conspicuousl}' elongate G. Jicicola n. ^p. Greenish yellow. Cornicles slender and very long G. quercifoliae n. sp. (3) Caudal segment witliout a process (4) Caudal segment with a process (o) (4) Yellow, without a black patcli on the dorsum G. taiwdua n. sp. Pale yellow, with tlie dorsum of abdomen l)lackish G. nigrofasciatum (^\ak\). 64 K. TasaViashi : (5) Hlack G. nif/rum (N\aki.) Yellowish brown (7. /oy/«o«am mm&mm. no. i38, p. 342 (19 is). Hosts. — Quercus spp. Distribution. — Formosa. 56 K. Takaliashi : Greenideafickolaw. sp. (I'L. vii, 1, figs. 6-10 and PL. vii. 2, figs. 6-7). Wingless viviparous female. VelU)\vi>li l>r(i\vn or uaik l>r()\vn. Body with uiaiiy long stuul ln'istles. some of which are knobhed. Frontal tubercles very short. Eyes small, with a prominent ocular tubercle. Antennae with many h)ng bristles; the relative lengtli of joints as follows: 111-44... 4f^, IV-31...33, V-32...33. VI-87 (26 + 61). ..89 (26+63). Head and prothorax not well-defined. Al)domen circular, somewhat convex. Cornicles long, broadest at tlie middle, with numerous long bristles intermixed with many luinute liairs on the apical portion. Anal plate not siuuated. Cauda with, a distinct process. Length of body — 2.2 mm. Antenna — 2.1 mm. Cornicle — 0.7 nnn. Winged viviparous female, (xeneral colour yellowish green. Head yellowish brown. Kyes red. Antennae black, Pronotum and n'iest)thorax dusky. Dorsal surface of abdomen dusky on the apical half, on the basal lialf with a few small dusky spots. Legs yellowish bi'own: til)iae lilaekish bri)\vn or l)lack. Cornicles black. Cauda pale green. A\'ings hyaline: stigma dusk3% veins lirown or l)lackish brown. Body elongate, broadest at midlength of the abdomen. Head a little shorter than the prothorax, with some long bristles between tlie antennae. Kyes large; ocular tubercles very prominent. Frontal tubercles very short. Antennae with many long bristles; the 3rd joint provided with 20-23 circular or oval sensoria arranged in a low from tlie base: the 4th lacking sensoria; the relative length of joints as follows: 111-07, IV-35, V-?, VI-? Rostrum long and' slender, extending be.yond the hind coxae. Prothorax with many long bristles on the sides. The 2nd oblique distinctly curved; the 3rd twice forked; stigmatic vein reaching the apex of wing; hind wings with 2 obliques not jjarallel; Aphididae of Formosa. — I. 67 booklets 3. Abdomen witli a few short bristles on each side, these shorter than those on the head. Cornicles ver_y long and slender, with many long bristles. Cauda with a process. Legs long and slender, with many very long setae. Length of body — 2.") mm. Antenna — V Fore wing — 2. 7 mm. Width of fore wing — 1 .0 mm. Cornicle — 1-3 mm. Host. — Ficus retusa; Fictis obscura. Distribution. — Formosa (Taihoku; Urai). Greenidea talwana n. sp. (PL. vi, 2.). Wingless viviparous female. Yellow. Eyes red. Antennae yellow: apex of the Tith, and the 6j^ joints dusky. Cornicles yellow, except the black apex. Caudal segment concolourous with the remainder of body. Legs yellowish l:)rown; tarsi dark brown. Body with numerous hairs that are not knobbed. Eyes rather small. Antennae 5 or 6-jointed, with long bristles; the 3rd joint lacking sensoria and imbricated; the relative length of joints as follows: III-50, IV-13, V-16, VI-33(12 + 21). Head and prothorax not well-defined. Rostrum slender, reaching beyond the hind coxae. Cornicles long and stout, nearly equal in width through their length, l)ut the apical portion gradually narrowed towards the tip; the surface covered with many long bristles intermixed with many minute hairs "at the apex and not furnished with " spinule-rows. " Last abdominal segment rounded and not produced into a process. Legs slender, with many long bristles. Length of body — 1.7 nun. Antenna — 1.2 mm. Cornicle — 0.75 mm. Winged viviparous female. Head brownish green. Eyes red. Antennae black, paler at the CjH ■ ^' Takahashi : bases of tlie 4tli ami ">tli joints. Pronotum brownish green, witli a dusky portion on each side. Mesothorax dusky. Abdomen yellowish green, the doi'suni mostly dusky. Cornicles black. Last abdominal segment pale green. Anal plate dusky. Wings hyaline; stigma black; subcosta brown; obliques blackish brown or black. Legs j^ellowish brown, with tarsi black. Body oblong ; head and pronotum with many long rather fine hairs; abdomen with some shorter hairs. Antennae 6-jointed, furnished with rather long, stout bristles; the 3rd joint with about 25 oval sensoria distributed over the whole length; the relative length of joints as follows : III-72, lV-21, V-25, VI-48 (19 + 29). Rostrum slender, reaching the hind coxae. Cornicles extremely long, cylindrical, with numerous long and rather fine hairs intermixed with minute hairs on the apical portion. Caudal segment rounded, without a process. Veins normal: the 2nd oblique conspicuously curved and the 3rd twice forked; hind wings with 2 obliques not parallel; booklets 3. Legs long and slender, with many long hairs. Length of body — 2.4 mm. Antenna — 2.0 mm. Cornicle — 2.0 nmi. Fore wing — 2. 75 mm. Width of fore wing — 1.0 nun. Host. — 3Ieliosma rhoifolla. Distribution. — Formosa (Shinten). Wingless and winged females have been collected by the author in June. Eutrichosiphum lithocarpac (Maki.) Tr Ichosiphum lithocarpac N\.ak\. l&l^l^H Sif^*^ No. 138, p. 344 (1917). Maki, Entom. iMag. Kyoto, Japan, iv, pt. 1, p. 21 (1919). Host. — Lithocarpiis sp. Distribution. — Formosa (Urai). Aphididae of Formosa. — I. 69 Subtribe Cervaphidini. Cervaphis quercus Takahashi. Zool. Mag. Tokio, p. 458 (1918). Host. — Quercvs vm-iabilis. Distribution. — Formosa (Taihoku); Japan (Tokio). Hitherto unrecorded from Formosa. In m}' opinion, Anomalaphis Baker does not belong to this subtribe, and Cervaphidini is closely related to Trichosiphini in the following characters: (1) Head and pronotum of the wingless female not well defined, often fused together. (2) Ocular tubercles of the winged form ver}- prominentl_y pro- /^ tuberant. (3) Cornicles very long, projecting horizontally behind, provided with bristles. (4) Caudal segment sometimes with a process. (5) Spiracles sometime prominently protuberant. (G) Oviparous females winged. (7) 2nd obliques of fore wings curved. Tribe Callipterina. Key to subtribes. (1) Eyes without ocular tubercles '^uhivihQ Saltusaphidmi. Eyes with ocular tubercles (2) (2) Antennae provided witli many long, prominent hairs; anal plate not sinuted Subtribe Ghaitophm-ini. Antennae not provided with many long hairs; anal plate often bilobed (3) (3) Cornicles as long as or longer than wide. Subtribe CaUlpterini. Cornicles much shorter than long (4) (4) Eyes of the wingless female very small and rudimentary Subtribe Neophyllaphidini. 7(3 K. Taka)iashi ; Eyes of the wingless female large Subtribe Fhi/Uaphldini. Subtribe CalUpterini. (1) Cornicles nearly as luug as wide CW/(jo^fcrit.s Koch. Cornicles longer than wide Jfyzocalli!< Pbss. Key to Formosan species of MyzocalUs. (1) Abdomen with jjroniinent tubercles (2) Abdomen without prominent tubercles. ... M. bambuclj'oliac n. sp. (2) Yellowish; abdomen with slender finger-like tuliercles. ...(o) Dark purplish oi- lilaekisb; abdomen with large, stout tui)ercles. 31. bamhiclcola n . sp. (o) Head and tlioi'a.x witli pvoniineiit capitate hair jr. quercifoniiosamts n. sp. Head and tboi'ax without eai)itate hairs. Jf. pscvdoalni n. sp. 3IyzocalUs bambucicola n. sj). (PJ.,. v, 2, tigs. 1-7). Black somewhat ubscured by a pui'plisli tinge. Antennae and legs white. p]yes dark red. Rostrum jxale green. Tubercles on the dorsum and cornicles concolourous with the body. Cauda paler. AVings hyaline, slightly clouded at the base; stigma gray: veins colourless. Body broad, and widest at midlength of the abdomen, without hairs. Frontal tubercles very short. Antennae very long and .slender, without hairs; the 3rd joint with about 5 small circular sensoria in a row near tlie base; the 4th very slightly imhricatud; the relative length of joints as follows: III-51, IV-33, V-30, VI-49 (20 + 29). Rostrum very short and stout, not reaching the middle coxae. Abdomen on tlie (horsuni with <) |);iirs of bluut tul)ercles, the 1st 2 pail's t)f wiiicli are ver}' large, and ibe last 2 are very small; in front of the cornicles there are veiy large, conspicuous tubercles. Cornicles much longer tlian wide, slightly constricted near the end. Cauda globular, constricted at the base, hu-nished with many long hairs. Anal plate bilobed. Legs long and very slender, witli many Aphididae of Poruiosa. — I. Yl sliurt hairs. Fore wings witli typical veins, stigmatic vein being obsolete; hind wings with 2 obliques slightly divergent; booklets 2. Length of body — 1.7 mm. Antenna — 1.6 mm. Fore wing — 2.0 mm. Width of fore wing — 0.9 mm. Host. — Dendrocalamus laiiJlo7'us. Distribution. — Formosa (Taihoku). Like other species of Myzocallis, this interesting aphis is sporadic in habit, and jumps from the host when disturbed. Jlyzocallls pscudoabil n. sp. (PL. vii, 1, hgs. 1-5). Winged viviparous female. /^ Yellow. Eyes red. Antennae yellow; apices of the 3rd, 4th and 5tli joints, and the 6th, as well as the middle part of tlie 3rd, dusky. Dorsal tubercles on the abdomen concolouruus witli the l:)ody, but that on the 2ud abdominal segment at the apex dark and that on the 5th blackish. Cornicles yellow, the apices black. Cauda yellow. Wings along the veins clouded; stigma pale brown; veins brown or black. Legs yellow. Body furnished with a few hairs. Frontal tubercles very short. Antennae very slender, with a few very short hairs; the 3rd joint near the base provided with 6-7 small circular sensoria in a row; the 4th very slightly imbricated, without sensoria; the relative length of joints as follows: III-70, IV-44, V-43, VI-36 (16 + 20). Rcjstnmi not reaching the middle coxae. Abdomen on each side with several very short blunt inconspicuous tubercles and along the longitudinal axis of the dorsum 4 large finger-like tubercles, of which the 1st 2 are subequal in size, the 3rd a little shorter than the 2nd, and the last the smallest. Cornicles much longer than wide, slightly constricted at midlength. Cauda globular, constricted at the base. Anal plate bilobed. Legs long and slender, with many short hairs. Wings rather narrow; veins normal; booklets 3. Length of body — 2.0 mm. Antenna — 2.0 mm. Fore wing — 2.6 mm. Width of fore wing — 0.9 mm. Y2 K- Takahashi : Host. — Alntis formosana. Distribution. — Formosa (Taihoku). Myzocallis qvsrciformosanus n. sp. Winged viviparous female. Yellow. Eyes yellow. Antennae yellow, with the apices of joints blackish. Cornicles, cauda, and tubercles on the dorsum yellow. Wings hyaline; stigma and veins pale yellow. Legs pale yellow, apices of tibiae slightly dusk^^ Body narrow. Head with 3 pairs of very long capitate hairs, arising from short tuliercles, between the antennae. Antennae long and slender, somewliat imiiricated; the 1st joint much larger than the 2nd, distinctly convex on the inner side, with a moderately long stout capitate liair; the 3rd joint provided with about o circular sensoria in a row (Ui the basal half and 4--"i short capitate hairs: the 4th joint lacking sensoria, witlmut hairs: the relative length of joints as follows: III-54, IV-4(), V-31, VI-50 (l.-^ + 3.'3). Rostrum stout, reaching almost tlie middle coxae. Pronotum with a pair of capitate hairs, which are shorter tlian those on the head, at the middle near the front margin, and a pair of finger-like tubercles, which are .shorter than those on the abdomen, at tlie middle near the hind margin. Mesonotum witli 7 pairs of veiy long capitate hairs whicii are as long as those on the head or the l)asal twc> antennal joints taken together. Wings narrow; stigma stout; stigmatic vein somewhat obsolete; upper branch of the 3rd oblique reaching the wing apex: liind wings with 2 almost jmrallel obliques; booklets 5. Al)domen without capitate hairs, but with many moderately long hairs on the dorsum and the underside; the 3 basal segments with a pair of large, linger-like tubercles at the middle of the dorsum, of which the front 2 i)airs oqual in si/e, and somewhat shorter than the hind one; 4 small lateral blunt tubercles present in fi'ont of the Aphididae of Formosa — I. 73 'Cornicles. Cornicles longer than wide, nai'rowcd at the middle, about 2.4 times as long as wide at midlength. Cauda globular, al)Out as wide as the cornicle constricted not strongly at the base, with 2 pairs of very long bristles which are not capitate. Anal plate some- what deeply bilobed, with many normal bristles. Legs slender, with many short capitate and normal hairs. Length of body — 1.6 mm. Antenna — 0.9") mm. Fore wing — 2.3 mm. Host. — Quercus dentata. Distribution. — Formosa (Taichyu). Many specimen^ were collected by Mr. K. Sawada in ]\Iareh, 1921. This species is distinct from all the species of 3Iyzocallis known to me by the very prominent capitate hairs on the head and by the ■antennal structure. Myzocallis bambuclfol'me n. sp. Winged viviparous female Pale yellow. Eyes pale yelluwisb green. Antennae jiale yellow, basal 2 joints blackish, basal third of the ord joint and apices of the ord, 4tli and 5th black, the 6th dusky. Head with a longitudinal brown line. Pronotum narrowly brown at eacii side, with a longitudinal brown line at the middle. Mesonotum slightl}' brownisli at the front angle, with a pair of longitudinal brown lines. Metanotuni with a pair of black patches at the middle. The 1st— 7th abdominal segments with a pair of distinct, black markings at the middle of the dorsum, the 8th segment with a l:)lack spot on tlie dorsum. Cornicles and Cauda yellow. Wings hyaline; stigma p-ale \'ellow, veins br(.)wn or dark brown. Legs pale yellow; tarsi dusky. Body oblong, without prominent hairs. Head as long as the prothorax. Frontal tubercles absent. Antennae long and .slender, witji a few very small hairs; the 3rd joint with 5 or 6 \eiy small. 74 ^- Takahashi ; transver^iely oval sensoria iu a mw from the l)ase: tliL' 4tli jwiiit lacking Hitjiisovia; the relative length of joints as folic iws: III — '.H'), IV — 64, V — 58, VI — 6o (30 + 35). Rostrum very shoi1, reaching a littk- i)eyond the front coxae. Ahdonaen without distinct tubercles, but with 3 very short, blunt ones on the side. Cornicles rather short, almost as long as wide, constricted at the middle, with a long l>ri>tle near the liase. Cauda globulai'. Anal plate distinctly bilobed. ^N'ings normal, not narrow: stigma not wide; stigmatic vein jn-esent; hind wings with 2 not parallel oliliques; booklets 2. Legs with many moderately long bristles. Length of bod}' — 2.Snnn. Antenna — 3.()nnn. Fore wing — 3.15 nnii. Host. — Bambusa sp., attacking the leaf. Distribution. — Formosa (Taihoku). This species is very closely related to Mi/zocaUis arundicolens (Clark), but differs from it in the colur of the antennae and the abdomen. Callipterus hohawdluokalunl (Kirk.) Jlt/zocallis IcahawaluokalanJ , Kirkaldy, Proc. Hawaii Knt. Soc, i, pt. 3, p. 101 (1907). MonelUa lagerstroemeae, Takahashi, Zool. Mag. Tokio, xxxii, No. 378, p. 118 (1920). Hosts. — Lagerstroemia spj). Distribution. — Formosa (Taihoku); Japan (Tokio). Hawaii (Kirkaldy). Hitherto unrecorded from Formosa. Sub tri be Phijllai tit id in i, Shivaphis Cf'Ui Das (I'L. xi, I.). Mem. Ind. Mus. vi, pt. 4. p. 240, pi. xxix, figs, l-ld (19i,s). Hosts. — Celtis spp. Aphididae of Formosa. — I. 75 Distrilnition. — Formosa (Taihoku). India (Das); Ceylou (v. <1. Goot). Hitherto unrecorded from Formosa. This species is very closely related to Shivaphis ceUicolens (Essig et Knwana). In S. ceUicolens, the brachypterous form (immediate) appears very commonly, but in the present species, this form is not found. The winged viviparous females of ShlvapJiis celti J )as are very common from the spring onwards throughout tlie autumn, but they are extremely rare in the winter, when usually only the wingless viviparous females may be seen. I have collected only a few males of the present species in December 1920 and .Januar 1921 in Tailioku, but no oviparous females have been discovered. Subtribe SaltusaphidinL Phyllaphoides n. g. Wingeil form : l')ody oblong, soft, witliout prominent hairs, l)Ut with white cottony secretions. Eyes prominent, but without ocular tubercles. Frontal tubercles absent. Antennae of 6 joints, as long as the body; sensoria circular; spur as long as the base- Rostrum not long. Thorax normal. Wings hyaline; the 3rd oblique twice forked; hind wings witli 2 obliques. Cornicles very short, much wider than long, scarcely more than pores. Cauda globular, constricted at the base. Anal plate bilobed. Legs slender; tarsi without limpid empodial hairs. Closely related to Thripsaphis Gillette, from which it is distingui- shed by the structure of head and by the body having white cottony secretions, but lacking spine-like hairs. Type. — Pkyllapholdes bamhuclcola n. sp. Phyllaphoides bambuclcola n. sp. (PL. vi, 1,) Winged viviparous female. White ; mesothora.x pale yellow. Eyes black. Antennae white, 76 K. Takahashi : with the apice? of joint? dusky. Legs white. Wings hj-ahne; stigma and veins colourless. Body soft, oblong, with some cottony wax and a few short fine hairs. Head as long as the prothorax: vortex not prominent. E5'es large, without ocular tubercles. Frontal tubercles absent. Antennae with a few very minute hairs; the 3rd joint with 3-4 small circular sensoria in a row near the base: apical sensoria of the 5th very small; the 6th scarcel}^ imbricated; the relative length of joints as follows: Til — 69. IV — 47, V — 41. VI — 39 (21 + 18). Rostrum very short, reaching the front coxae. Body without dorsal and lateral tubercles. Fore wings rather naiTOw; .stigmatic vein obsolete; the 3rd oblique twice forked; hind wings with 2 obliques parallel; liooklets 2: wings carried normally when at rest. Cornicles very short, little more than pares. Cauda globular, con- stricted at the liasr. Anal jilate bilol)ed. Legs slender, with some minute hairs; hind Ifiis with cottony wax, the femora somewhat ■dilated: tarsi very long: claws very long and nearly straiglit Length of body — 1.6 mm. Antenna — 1.5 mm. Fore wing — 2.0 mm. Width of fore wing — U.S5 mm. Host. — Bambxi^a sp. , attacking the leaf. Distribution. — Formosa (Taihoku). This aphis is found ow the underside of the Hambusa — leaf, and •does not jump from the host when disturbed, but walks rather actively. Subtrilie Nccyphyllaphidini. Neophyllapliij^. Takah., in my opinion, has every claim to be recognised as a distinct subtribe. It may be near the Phyllaphid'mi, but is i of the wingless form very small and rudimentary; tliose in the winged form large, with ocular tubercles. Body without tube- rcles. Cornicles much wider than long. Wings carried nornjally when at rest; the 3rd oblique twice forked. Cauda constricted at the liase. Anal plate slightly sinuated. Oviparous females winged. Neophyllaphis podocarpi Takah. (PL. ii, 2, figs. 0-9) Canad. Entom. p. 19(1920). Wingless viviparous female. Dark reddish purple. Eyes black. Legs pale brown. Antennae pale brown, apices of the joints slightly infuscated. Body soft, narrow and somewhat flattened; slightly pulverulent, but not hairy. Head large, with a pair of waxpores on the dorsal surface; vertex very wide. Eyes very minute, rudimentary. Frontal tubercles lacking. Antennae without hairs; the 3rd joint lacking sensoria; apical sensoria of the 5th small, circular; the relative length of joints as follows: III— 34. IV— 14, V— 15, VI— 15 (12 + 3). Rostrum long and slender, reaching beyond the hind coxae. Cornicles very short, much wider than long. Cauda long, with the apex rounded, conspicuously constricted at the base and slightly so at the middle. Anal plate slightly sinuated. Legs moderately long and slender, with a few short hairs; limpid empodial hairs absent. Lengtli of body — 1.7 mm. Antenna — 0.8 mm. Winged viviparous female. I have formerly described the male as the winged viviparous femal in the "Canadian Entomologist" (p. 19, 1920) and now correct this as follows : General colour dark reddish purple. Head, eyes and tliorax black. Antennae dusky. Wings hyaline, stigma and veins pale brown or gray. Legs pale blackish brown. Cornicles black. Cauda pale brown. 78 R. Takahashi. I>f)(lv soft, narrow, with sdine pdwck'r and no liairs. Eyes large, with ocuLir tul^ercles. Frontal tuhercles lacking. Eostrnm, oorniclep, Cauda and legs almost as in the wingless female. Antennae lacking hairs; the 3rcl joint with 40-45 long encircling transverse sensoria regularly distrii)Uted over the whole lengtli; the 4th lacking sensoria; apical sensoria of the -Ith circular and very small; the relative length of joints-.as follows: III— 71. TV— 2S. V— "iS, vi_2ri (20 + .")).. Wings normal: the :^rd olilique twice forked: hnid wings with 2 ohliques; hooklets 2. Length of liody — 1.17 mm. Antenna — 1.1 mm. Fore wing — 2.">mm. \Viiltli c)f fore wing — l.Omni. Host. — Podocarpiis chinensls- Distrihution. — Formosa (Taihoku): Japan (Tokio, C'hiba). Hitlierto unrecorded from Formosa. This peculiar aphis is very common in Taihoku, and many winged and wingless viviparous females may be seen at almost all times. Near Tokio, the sexual forms occur in the spring, summer and autumn rather commonly. 1iut in Formosa they appear to he quite rare; since I have collected only a winged oviparous female in Taihoku in May. The eyes of tlie wingless form of this species con.^ist of three facets. Many immediate forms often occur, however, in wliicli iUv immediate nature is indicated only by the eyes wliich h.ive the beginnings of compound eyes, such as are found in the winged form. But there never are complete compound eyes. Sul)tribe Chaitophorini. Periphylliis formosanus n. sp. (i'L. .\iv. 2, figs. 11-13). Wingless viviparous female. Reddish brown, thorax somewhat lilackish. Eyes dark brown. Antennae lirownish yellow; a])ex of the ."ith joint, and the 6th black. Cornicles and cauda dark Imowu. Legs brownish yellow, apices of tibiae and hind femora blackish; tarsi black. Aphididae of Formosa. — I. ' " Body with many veiy long rather stout hairs. Antennae witli some very long liairs; the 3rd joint slightly imbricated on the apical portion, without sensoria: the Bth joint with 0-2 hairs; the relative length of joints as follows: III— SO. IV— 42, V— 35, VI— 08 (1 + 52). Rostrum short, not reaching the middle legs. Cornicles short and rather stout, very slightly longer than wide, not as long as those of the winged form. ( 'uuda very short, much wider than long, not constricted at the base, with the posterior margin l)roadly r(,iunded- Legs rather stout, witli many very long bail's: tarsi iml)ricated, with 2 transparent empodial hairs. Length of body — 2.5 mm. Antenna — b>S inm- Winged viviparous female. Head, eyes, thorax and cornicles black. Antennae pale brown, the apical halves dusky. Abdomen reddish brown, with blackish bands on the dorsum. Legs pale brown; apices of fore tibiae, apical halves of middle and hind femora and tibiae, and tarsi black. Wing- veins brown, stigma pale brown. Body with many very long bail's. Antennae with some very long hairs; the 3rd joint provided with 4.5-50 circular or oval sensoria of various size scattered over the whole lengh; the 4th joint with 2-5 sensoria in a row on the basal half; the 5th joint with an apical sensoria; the 6th joint with 0-1 long hair; the relative length of joints as follows: III— 110, iV— 4iuted; the 1st joint a little larger than the 2nd; the ;>rd joint almost as long as the basal 2 joints taken together: the 4th joint as long as the ."ird- Rostrum very stout, not reaching the nnddle legs. Cornicles much wider than long. Cauda much wider than long, constricted at the base. Anal plate bilobed. Length of Itodv — rl.o mm. Aphididae of Formosa. — I. 91 Winged viviparous female. Body oblong, almost without hairs. Eyes large, with small ocular tubercles. Head with a pair of minute blunt tubercles which are hardly visible. Antennae very short; the 3rd joint with 23-24, the 4th 7-10, the 5th lU-11 annulations; the relative length of joints as follows : III —47, IV— ly. V— 25. Rostrum not reaching the middle coxae. Fore wings with the 3rd oblique once forked, which is obsolete at the base and more slender than the 1st; the 1st and 2nd obliques united at their bases; stigma large; hind wings with 2 not parallel, long obliques; booklets 2. Cornicles very short, much shorter than those of the wingless form. C'auda and anal plate almost as in the wingless form. Legs slender, with some moderately long hairs. Length of body — 1.7 mm. Antenna — ^U.65 mm. Fore wing — 3.3 mm. Host. — Panicuvi patens. Distribution — Formosa (Taihoku. Urai). This aphis is distinguished from 0. panic! v. d. Goot by the antennal structm'e. The wingless viviparous female of 0. panicola n. sp. has 3-6 circular wa.x glands on each side of the thoracic and abdominal segments and '.) on tlie middle of tlie dorsum of the Sth abdominal segment. Cei'ataphis latanlac (Boisd.) Coccus lataniat. Boisd, Ent. horticole, p. 355, figs. 41)-5(J (1867). BoisduvaUa lataiiiae, Signoret, Ann. Ent. Soc. France, (4) viii, p. 400, pi. X, figs. 2, 2 A (1868). Cerataphis lataniae, Lichtenstein, Bull. Ent. Soc. France, II, p. 17 (1882); Buckton, Monog. Brit. Apliid, iv, p. 198, pi. cxxxiv (1883); Embleton, Linn. Soc. Jour. Zool. xxiv, pp. 00-106, pi. xii (1903); Fullaway, Ann. Kept. Hawaii Agr Expt. St., p. 44 (1910); van der 92 K. Takatiashi. Goot, Contrib. Fauna Ind. Xeerland. i, iii, p. KV.) (I'.MT): Matsumura, Collect. Essaj^s. for Xawa. p. 5(S (l'.M7). Ceralovacuna braslliensis. Hempel, Ann. .Mag. Nat. Hist. ser. 7, \iii, p. 384 (]'.)() I). !&dtm]^ ^mp^m^mm^ no. i, pi. tb, p. -mi oz^Em^) Hosts. — Latania spp. ; Cocos sp. Distribution. — Formosa; India (IJuckton); • .Malay (Embleton); •Java (v. d. Goot); Hawaii (Fullaway): Brasil (Hempel); North America; Europe. Su 1 )tri I le Iformaphidini. (1) Wingless form provided with distinct legs and antennae Aleurodaphls V. d. Goot. Wingless form often not provided with distinct legs and antennae. Astegopteryj- Karsch. Aleuroduphis blumeac v. d. Goot. Contrib. Fauna Indes Neerland. 1, 3, p. 240 (l'.)l.s); Baker, U. S. Dept. Agr. Bull. 826, p. 68, pi. XVI, A— E (1920). The Formosan specimens exactly agree with the .lavanese A. blumeae, except that in the former, I have examined, the antennae are only 4-jointed. Host. — Hlumea chinensi><. Distribution. — Formosa (Tailioku); Java (v.d.C.). Collected by Mr. E. KurosaAva in May ]'.»2]. Hitherto unrecorded h-oin Formosa. Key to Formosan species of Astegopieryx. (1) Tiie 3rd antenna! joint with 35 annulations... A. yiganteum n. sj). 'I'he 3rd antennal joint with 17-24 annulations (2) (2) Wings along the veins infuscated A. qiwrcicola n. a^. Wings along the veins not infuscated A. styraeicoln n. sp. Asteyopteryx yiganteum n. sp. (I*L. xiv. 2, figs. 6-10). Aphididae of Formosa. — I. 93 Winged viviparous female. Described from only a single specimen. Bod.y black, almost lacking hairs. Head small, without hornlets. Eyes large, with distinct ocular tubercles. Antennae short and stout; the 3rd joint with 35, the 4th 17 and the 5th 11 annulations; the relative length of joints as fuUows : III— 3U, IV— 21, V— r4. Rostrum very short, not reaching the middle coxae. Mesothorax verN' large. Wings ample, dusky, infuscate on the basal area; the 1st oblique somewhat stouter than the 2nd, the 1st and 2nd obliques united at their bases; tlie 3rd oblique once forked, obsolete at the base, as stout as the stigmatic vein; subcosta with 12-16 minute circular sensoria over the whole length and 7 very minute sensoria near the base: hind wings with 2 divergent obliques; booklets 5. Cornicles very short, represented b}' pores. Spiracles slightly protuberant. Cauda wider them long, very slightl}- constricted at the base; with some bristles. Anal plate bilobed, with some bristles. Legs slender, with many Jiairs; the 2nd tarsus with 2 long capitate hairs. Length of body — 2.0 mm. Antenna — 0.75 mm. Fore wing — 3.0 mm. Width of fore wing — 1.2 mm. Host. — Ficus rcttim f Distribution. — Forn^josa (Taihoku). ( )nly a specimen was collected on a leaf of Ficus letv-^i in Ma}', 1920 by the author. This species is easily distinguished from other species of Astegopteryx by the number of the antennal sensoria. Aslegopteryx qnerclcola n. sp. Winged viviparous female. Described from specimens preserved in alcohol. Head black. Eyes blackish brown. Antennae pale l)lackish brown. Mesothorax blackish brown. Abdomen yellowish brown. Legs dark yellowish brown. Wings along the 1st and 2nd obliques 94 R. Takahashi. somewhat infuscate; clouded border of the 1st ohlique liroader than that of the 2nd. Body without hairs and wax. Head very small, lacking horns. Eyes large; ocular tubercles very small. Antennae short and stunt; the 3rd joint with 22-1^4, the 4th 10, and the 5tli annulations; the i-elative length of joints as follows : III — 53, IV — 26. V — 21. Rostrum very short, reaching a little beyond the front coxae. Wings ample; the 1st and 2nd obliques neary united at their bases; the ord more slender, obsolete at the l>a.se; stigma large; stiginatic vein reaching the wing apex; hind wings with 2 divergent obliques; booklets 2. Cornicles represented only by rings. Cauaso; the 3rd obsolete at the base and not forked; hind wings with 2 obliques; booklets 2. Cornicles inconspicuous. Cauda very short, not distinct, with the posterior margin rounded. Anal plate normal. Legs short and slender, w-ith some verj"- small setae. Length of body — 1.4 mm. Antenna — U.4 mm. Fore wing — 1.G mm. Width of fore wing — 0.6 mm. Host. — Bhvs semialata, producing galls. Distribution. — Formosa (Taihoku, Kwanshirei); Japan.' The species leaves the gall on the sumniei- host, li/ius semialata, and migrates to an unknown plant in the autumn in Formosa, as in Japan. Subtribe Fordini (1) Antennal sensoria of the winged form small and scattered over most of the segment Parac/efw.s Heyden. Antennal sensoria of the winged form larger and mostly arranged in one line (S^eo/ca Hart. Geoica IncifiKja (van der Gootj. Serratuphh lucifuga. van der Goot, ( 'oiitrib. Fauna Indes Neerland. 1, iii, p. 264 (1917). Aphididae of Formosa. — I. •'' Host. — Saccharum officlnarum, attacking the root. Distribution. — Formosa (Daimokko); Java (v. d. Goot). Hitherto unrecoreded from Formosa. Collected by Mi'. :M. Isbida. Paracletus cynodontl (Das.) (PL. xiv, 2, figs. 17-18) Peniphlgm? cynodontl, Das, Memoirs Indian Mas., vi, p. 153 (1918). Host. — Cynodon dactylon- Distribution. — Formosa (Taihoku); India (Das.) Only wingless viviparous females have been collected by Mr. E. Kurosawa. Subtribe Eriosomatlni. Tetraneura javensis, van der Goot. Contrib. Fauna Indes Neerland., i, iii, p. 260 (1917). Host. — Saccharum officinarum, attacking the root. Distribution. — Formosa (Daimokko); Java (v. d. Goot). •Hitherto unrecorded from Formosa. Only a few wingless viviparous females have been collected by Mr. M. Ishida. Subtribe Pemphiglni. Dryopeia hirsida Baker, (PL. xiv, 2, figs. 4-5) Mthly. Bull. Dept. Agr. Cahf., vol. x, No. 4, p. 159 (1921). The Formasan specimens, I have examined, exactly agree with tlie Philippine D. hirsuta, except that in the former the 3rd antennal joint is more longer compared with that of the latter. Host. — Oryza sativa, attacking the root. Distribution. — Formosa (Tainan); Philippine (Baker). Collected by Mr. Sawada. The winged form has never Ijeen collected. Hitherto unrecorded from Formosa. PLATES. Explanation of Plates. Plate I. (I) Macrosiphum tieoartemisiae n. sp. (Wingless viviparous female) Fig. 1. Head. Fig. 2. Antenna. 3. Hind tarsus. 4. Cauda. 5. Cornicle. Macrosiphoniella formosartemisiae n. sj). (Wingless viviparous female) Fig. 6. Head. Fig. 7. Cornicle. 8. Cauda. 9. Antenna. (2) Macrosiphum alopeculi u. sp. (Wingless viviparous female) Fig. 1. Head. Fig. 2. 3rd antennal joint. 3. Cornicle. 4. Cauda. 5. Cauda. Macrosiphum- miscanthi u. sp. (Wingless viviparous female) Fig. G. Head. Fig. 7. Cornicle. 8. Cauda. Macrosiphum granarium (L.) (American specimen) (Wingless viviparous female). Fig. 9. Cauda. Fig. 10. Coruicle. Aphis somei Essig et Kuw. (Winged viviparous female.) Fig. 11. Head. Fig. 12. Antenna :(ioints 3-5) 13. Antenna (joint 6) 14. Cauda. 15. Hind tarsus. 16. Cornicle. (Wingless viviparous female). Fig. 17. Cornicle. Fig. 18. Cauda. < ,_^gJgI^ffI^r|fflla^afk^llll rTITr^Ml,>^l^|;-] ;;^^ 77-^>- Explanation of Plates. Plate II. (1) Myzus polypodiadcola n. sp. (Wingless viviparous female) Fig. 1. Head. * Fig. 2. Cornicle. 3. Antenna 4. Cauda (side view) 5. Hind tarsus Myzus woodwardiae n. sp. (Wingless viviparous female) Fig. 6. Head. Fig. 7. Cornicle. 8. Cauda. 9. Abdominal end. (2) Macrosiphum paederiae n. sp. (Wingless viviparous female) Fig. 1. Head. Fig. 2. Antenna. 3. Cornicle. 4. Cauda. 5. Part of the side of the abdomen. Neophyllaphis podocarpi Tak. (Winged viviparous female). Fig. 6. Antenna. Fig. 7. Head. (Wingless viviparous female) FisT. 8. Antenna. 9. Head. ^ " ' " ' n ITTTgi ^^CttmBrcoc arenc£ulinn3t> i-iiiiia: »? Crznrj: (M mmmmmmmmfj < •J Explanation of Plates. Plate III. (1) Macrosiphoniella citricola \au der Goot. (Winged viviparous female) Fig. 1. Head. 3. Cornicle. -5. Cauda. 7. Fore wing. (Wingless viviparous female) Fig. 8. Cauda. Fig. 2. Tarsus. 4. Antenna. 6. Fig. 9. Cornicle. 10. The 3rd antennal joint. (2) Fullawayella foriaosana u. sp (Wingless viviparous female) Fig. 1. Head. 3. Cornicle. 5. Fore wing. Fig. 2. Antenna. 4. Cauda. Aphis pomi De Geer. (Wingless viviparous female). Fig. 6. Head. Fig. 7. Tubercle on the protborax. 8. Cauda. 9. Cornicle. 10. Hind tarsus. 11. Antenna. < •J Oh Explauatinu ( A' Plates. Plate IV. (Wingless viviparous female). Fig. 1. Head. 3. Cauda. (1) Vesiculaphis caricis (Full) Fig. (Wiugecl vixiparous female). Fig. .5. Head (dorsal view) 7. Hind tarsus. 9. C'drnicle. 11. Hind wing. (Nymph) Fig. 13. Head. 2. Cornicle. 4. Antemia. Fig. 15. Head (ventral view) 8. Antenna. 10. Fore wing. 12. Abdominal apes (side view). Fig. 14. Cornicle. 2. Hind leg. (2) Aphis smilacifoliae n. sp. (Wingless vivii3ar(5us female). Fig. 1. Head. - Fif 3. Cornicle. 4. Caiida. 5. Cauda. 6. Antenna. (Winged viviparous female). Fig. 7. Head. Fig. 8. Cornicle. 9. Hind tarsus and part of the tibia. 10. Antenna. 11. Cauda. 12. Fore wing. Aphis Jicicold n. sp. (Wingless \i\iparous female.) Cornicle. Fig. 14. Hind tiir^us and pail of the tibia. 15. Cauda. IG. .Antenna. 17. Part of the side of the bodj'. Fig. 13 '-'-^---^^'^^^^^^■■^.^^^^::^>i^ (M ,..,„a»===0*=^'£=p™ < Pu eggraimna iiiniim ni i. M t;ni''ii 'j ii<7rr mjTin7"r"'7n;;r°T"M x^ GgrTrrTTTTi^r; . ^ .'.■.'.'. ^ i ;. T v .■ . - .-U rifi III Ml iiiTF^.ii'.i.-iJ ■^ r^ff^.T ' 'yi'^i^T'r'fr'^ C ^^^^^^^ ^ Kxplauation of I'lates. Plate VI. (1) PhyUuphoides n. g. hamhuckohi n. sp. (^'iiiged viviparous female). Fig. 1. Hind leg. 2. Antenna. 3. Fore wing. 4. Part of the wing-vein greatly magnified. 5. Head. 6. Body, with wings and legs removed. 7. Head of the nymph. 8. Ahdominal apex of the nymph. (2) (Wingless viviparous female) Fig. 1 . Body. 3. Cornicle. .5. Antenna. (Winged viviparous female) 6. Head. 8. Fore wing Fig Greenidea tancana n. sp. male) Fig. 2. 4. Head. Abdominal apex. ale) Fig. 7. 9. 3rd antennal joint. Abdominal apex. < ^CO Explanation of Plates. Plate VII. 0) Myzocallis pseudonlni n. sp. (Winged viviparous female) Fig. 1. Head. Fig. '2. Cornicle. 3. Antenna. 4. Forewing. 5. One of the tubercles on the dorsum of the abdomen. Greenidea ficicoJa n. sp. (Winged viviparous female) Fig. 6. Third autennal joint. Fig. 7. Fore wing. 8. Cornicle. 9. Head. (Wingless viviparous female) Fig. 10. Cornicle. (2) Greenidea quercifoHee n. sp. (Wingless viviparous female). Fig. 1. Head. Fig. 2. Cornicle. 3. .\ntenna. 4. Body. 5. Cauda. Greenidea Jicicola n. sp. (Wingless viviparous female). Fig. 6. Cauda. Fig. 7. Head. CM < J jttajtyTTTTrhmrn nI^l^^]|!^0^^^^^^^^|Jp. G53^!^ESa23^J^!52Eipi^2^^!:S^ilZa J X < tmtUK^S^^ Explanation of Plates. Plate XII. (1) AjyJiis gossypii Glove, var. caUicarpce n. (Winged viviparous female) Fig. 1 . Head. Fig. 2. Tubercle on prothorax. 3. Cornicle. 4. Cauda. 5. Hind leg. 6. Fore wing. 7. Antenna. 8. Abdomen. a. dark green b. dusky, c. yellow. Bracliycoliis heracuH n. sp. (Wingless viviparous female) Kig. 9. Cornicle. Fig. 10. Cauda. 11. Hind leg. 12. Antenna. (Winged viviparous female) Fig. 13. Cornicle. Oregma lanigera (Zebnt.) (Wingless viviparous female) Fig. 1 . Adult. Fig. 2. Head. 3. Hind leg. , 4. Abdominal apex. Aphis bambuscE Full. (Wingless viviparous female) Fig. 5. Hind leg. Fig. 6. Cauda. 7. Head. 8. Antenna. 'J. Cornicle. s ^*T"ii i 1 1 fr '^■'^"'^ 3aninai3QTjj23-, .^rs^i^^^^^^^^^^^^^^ (M X w < ^r^^^=:^ CK ^ lA CP SSSSajSCD iP5SQci^ l-".Nlil:ination of Plates. Plate XIII. (1) Bliopalosiphutn papaveri n. sp. (Wingless viviparous female) Fig. 1. Cauda. Fig. 2. Head. 3. Cornicle 4. Antenna. (Winged viviparous female) Fig. .5. Head. Fig. 6. Cauda. 7. Abdomen. 8. Cornicle. Apliis saliceti Kalt. (Wingless viviparous female) Fig. y. Outline of one abdominal side. 10. Cauda. 11. Cornicle. 12. Head. (Winged viviparous female) Fig. 13. Cornicle. Fig. 14. Hind tarsus. (2) Cavariella araliee n. sp. Fig. 1. Antenna. Aiceona (n. g.) actinodaphni u. sp. (Winged vivipaus female) Fig. 2. Antenna. Fig. 3. Wings- YaniMthphis papaveri n. sp. (Winged viviparous female) Fig. 4. Antenna. Fig. 5. Cauda. Ij. Cornicle. Anuraphis helichrysi Kalt. (Winged viviparous female) Fig. 7. Cauda. Fig. 8. Cornicle. \). Antenna. c^srssrssTEiS^I^jjS^ '77t7''r'ryf/, X Qu Explanation of Plantes. Plate XIV. (1) Myzus polygoniformosanus n. sp. (Wingless viviparous female) Fig. 1. Cauda. Fig. 2. Head. 3. Cornicle. Phorodon humuli (Schrank). Fig. 4. Head of wingless viviparous female. Brachysiphoniella (n. g.) gramini Takah. (Wingless viviparous female) Fig. 5. Cornicle. Fig. 6. Cauda. Aphis drosercB u. sp. (Wingless vivijDarous female) Fig. 7. Head. Fig. 8. Cornicle. . 9. Cauda. Aphis far mosanus n. sp. (Winged viviparous female) Fig. 10. Fore wing. Fig. 11. Cauda. 12. Hind tarsi. , 13. Cornicle. 14. Head. Ajihis sp. collected on Fiper hetle. (Winged viviparous female) Fig. 1.5. Cauda. Fig. 16. Cornicle. (Wigless viviparous female) Fig. 17. Cornicle. Fig. 18 Cauda. Aphis kurosawai n. sp. (Winged viviparous female) Fig. 1. Coruich. Fig. 2. Cauda. 3. Antenna. Explanation of Plantes. Dryopeia liirsuta Baker. (Wingless viviparous female) Fig. 4. Antenna. 5. Hind leg. Astegopteryx giganteum n. sp. (Winged viviparous female) Fig. 6. Part of antenna. 7. Head. 8. Cauda. 9. Anal plate. 10. Sensoria on subcosta. Feriphyllus foi-mosanus n. sp. (Wingless viviparous female) Fig. 11. Cornicle. Fig. 12. Head. (Winged viviparous female) Fig. 13. Apex of hind leg. 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