( 10 ) 
Genas Chaitophorus. 
Similar to Aphis (restricted) in form and antennae ; honey-tubes 
very short ; legs, antennae, and usually the body, hairy (hirsute). 
27. Chaitophorus negundinis, new sp. 
Winged individual (in glycerine). — Wings very thin and delicate, 
and veins very slender ; the costal vein bends outward from the base 
to the insertion of the second discoidal vein ; the stigmatic vein starts 
from the stigma far back near the middle, curves slightly and grad 
ually for a short distance and is then almost straight to the apex 
of the wing ; stigma very long and slender ; veins and stigma pale yel- 
lowish. Antennae nearly as long as the body, sparsely covered with 
long stiff hairs. Honey- tubes short. Apparently greenish. 
Found at Peoria, Illinois, in June, by Miss Smith, on Negundo 
aceroides. 
28. Chaitophorus populicola, new sp. 
Winged specimens. Antennae not very long, somewhat hairy. 
Wings transparent, but along each discoidal vein there is a broad 
smoky border ; stigma dark ; when examined by a strong power the 
wings appear to be covered with scales ; when examined by an ordi- 
nary pocket lens they present a very pretty appearance, as though 
marked by dark cross bands Head and thorax shining black: neck 
dull yellowish ; abdomen yellowish, with some irregular dusky patches 
toward the tip. Antennae, which reach about the middle of the abdo- 
men, dusky, the basal half paler ; legs dark, the bases of the femora 
pale ; beak short, reaching only to the middle coxae. 
Apterous female. Reddish-brown, or tortoise-shell color ; a large, 
yellowish, triangular or Y-shaped spot, (the forks pointing backwards) 
on the middle part of the abdomen ; honey-tubes reduced to simple 
tubercles, yellow. There is often a palish stripe along the middle of 
the head and thorax. Antennae pale yellowish at the base. Length 
about .05 of an inch 
Body more or less hairy ; and although my notes, made at the time, 
fail to mention the fact, I think that some, at least, of the apterous 
specimens were covered with tubercles. 
Found in July, at Carbondale, Illinois, and the first part of Septem- 
ber, at Dubuque, Iowa, on the under sides of the leaves of young 
sprouts of Popidus angulata. 
The remaining species of the tribe are placed in the genus Aphis. 
Those which are new and those heretofore described which 1 have been 
able to examine, appear to belong to the genus as restricted ; the 
others require further examination. 
29. Aphis vernoniae, new ep. 
Winged individuals. — Rather small, .06 to .08 of an inch in length 
to the tip of the abdomen ; .12 inch to the tips of the wings. General 
