386 S. MATSUMURA 
yellow, somewhat shorter than the body, anterhinarial nearly 2\ times as 
long as the postrhinarial, the 3rd joint on the outerside with 4 sensoria in a 
single row, much longer than the 4th, the 4th and 5th subeqnal ; pronotum 
on each side with a small tubercle ; wings hyaline, veins pale yellowish, 
stigma grayish, 2nd fuscal rather nearer the apex of the first; abdomen much 
broader than the thorax ; cornicles fuscous, long, somewhat broader at the 
base, not reaching to the caudal apex; cauda fuscous; at the base whitish, 
nearly one half the length of the cornicles, large, in the middle somewhat 
constricted, at the apex broadly conical ; legs greenish yellow, tarsi, tibial tips, 
as well as the larger parts of the posterior femora, infuscated. 
Length of body 1.3 mm.; exp. tegm, 4.2 mm.; antennae 1.1 mm.; cor- 
nicles 0.2 mm. 
Pupa — Dark green, oblong ; antennae much shorter than the body, the 
3rd joint nearly one half the length of the 6th, anterhinarial nearly 3 times 
as long as the postrhinarial ; pronotum on each side with a narrow tubercle; 
wingsheath concolorous, reaching nearly to the middle of the abdomen; cor- 
nicles moderately long, somewhat curved outwardly ; cauda very broad, short 
and of a blunt conical form. 
Length of body 1.3 mm.; antennae 0.8 mm.; cornicles 0.19 mm. 
Hab. — Hokkaido (Sapporo). 
F. P. — Ckrodoidron tricliotomum. 
Norn. Jap. — Kusagi-abura. 
24. Aphis colocasiae n. sp. 
Winged viviparous female — Body oblong; yellowish brown, dark brown 
or dark green ; antennae a little shorter than the body, the 3rd joint on the 
outer side with a row of 5 sensoria, a little longer than the 4th, anterhinarial 
nearly 2 \ times as long as the postrhinarial; rostrum reaches to the middle 
coxae ; thorax often with some fuscous spots ; wings long, nearly of a double 
length of the body, hyaline, with a pale yellowish tinge, veins fulvous, stigma 
gray, 2nd furcal near the apex of the first; abdomen and thorax of the same 
