200 
ous. Body rather elongate. Length 1.77mm; to tip of wings 2.79mm. 
It is with considerable doubt that I place this species in the genus 
Cattipterus. It is very probable that it should be placed under Asi- 
phum\ but the only description of this genus which has been publish¬ 
ed is that given by Koch, and, like the other generic descriptions 
which were made from memory after the loss of his eyesight, is 
somewhat unsatisfactory. The following is a translation of the salient 
points in his description: 
Asiphum , Koch.—“Beak short. Antennae rather short, the third, 
fourth, and fifth joints subequal, the apical joint very small, scarcely 
perceptible.Of this interesting species, I have only seen two winged 
specimens, mounted on a slide, which was communicated by a corres¬ 
pondent with the information that it occurred at Saint Louis, on Oak. 
CHAITOPHORUS. Koch, (emend). 
'! . ' . 
Similar to Aphis , but with the antennae and body distinctly pilose. 
Style tubercle-like. 
/ 
Chaitophortjs viminalis. n. sp. 
Apterous individuals .—Varying from pale green to light yellow, 
with two darker vittae on the abdomen, which are often obsolete. Entire 
insect covered with long white hair. 
Winged individuals .—Head and throax black; abdomen black, ex¬ 
cept the margins and style, which are yellow. Nectaries a little 
longer than thick, yellowish, often slightly fuscous. Antenna hairy; 
seventh joint filiform, almost as long as the three preceding taken 
together. Wings hyaline. Length 1.52mm; to tip of wings 2.54mm. 
On young twigs and leaves of Salix lucida and S. babylonica. The 
venation of the wings is exceedingly variable; in one abnormal speci¬ 
men I have observed a robust transverse vein running from the mid¬ 
dle of the second discoidal to the base of the lower branch of the 
cubitus, thereby forming a closed trapezoidal cell. 
CHAITOPHORUS SMITHIJ3. n. sp. 
Winged form —General color dusky reddish. Wings hyafine; vena* 
very variable. Nectaries two-thirds as long as the tarsi, vasiform, con¬ 
tracted at the base, expanding in the middle, and again contracted 
