(10) 

 Genus 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 Popvlus angxdata. 



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 



