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. 



