Aphididae of Formosa. — I. 55 



Winged viviparous female. 



Purple. Eyes red. Antennae dusky, except the basal half of the 

 3rd joint yellowish brown. 



Cornicles blackish purple. Cauda yellow. Wings narrowly 

 clouded along the veins; veins dark brown, stigma pale brown. Legs 

 pale yellowish brown; apices of femora and tibiae, and tarsi black. 



Body without hairs. Frontal tubercles very short. Antennae 

 imbricated, without hairs; the 3rd joint with al)0ut 8-13 sensoria of 

 various size not in one row on tlie whole length; the 4th without 

 sensoria; the relative lengtli of joints as follows: III — 24, IV — 18, 

 V— 18, VI— 41 (7 + 34). 



Rostrum stout, not reaching tlie middle legs. Prothorax and the 

 1st and 7th abdominal segments with a very small lateral tubercle. 



Wings rather narrow, the 3rd oblique reaching the wing-apex; 

 hind wings with 2 obUques somewhat divergent or parallel; booklets 3. 



Cornicles very short, not reaching the cauda, minutely imbricated, 

 2.5 times as long as wide, about as long as the hind tarsi, not dilated 

 at the middle. Cauda almost as long as the cornicle, with 4 pairs of • 

 lateral bristles. 



Length of bodj^ — 1.5 nun. Antenna — 1.0 mm. 



Fore wing — 1.9 mm. 



Host. — A plant of the Gramineae; Sorghum vulgare 



Distribution. — Formosa (Taihoku) 



Aphis miscanthl n. sp. (PL. ix, 1, figs. 17-19). 

 Wingless viviparous female. 

 Yellowish gray or dirty yellow or sometimes dark purple. Head, 

 eyes and cornicles black. Antennae pale brownish, with the apical 

 half black. Legs pale brown, except the apices of tibiae, and the tarsi 

 which are black. Cauda dusky. Body broad, with a few short hairs. 

 Head very small. Eyes small. Frontal tubercles lacking. Antennae 

 short, 5-jointed, Avithout liairs; the 3rd joint lacking sensoria, not 



