592 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



84. Lack mis sal icicoJ a Uhler (Aphis salicti Hart.). 



Mr. Monell has described au aphid uuder the name of Chaitophorus 

 salicicola which Professor Thomas (Eighth Hep. Ins. 111., p. 105) questions 

 whether it may not be Lachmis salicicola Uhler. We copy Harris' 

 description of his salicti. 



Stylo nuUo, corniculia hrevibusfulvis, corpore nigro, immaculato, alarum vents pedibxisque 

 fulvia. 



Black, immaculate ; wings hyaline, the veins, the auteun;e, coruiculse, and legs ful- 

 vous. Body black, immaculate; first and second joints of the antenna black, third 

 fulvous at base, remainder fuscous ; cornicula? short, fulvous ; legs fulvous, tibiae at 

 apex and tarsi fuscous. Length, about 1 line. Expanse of wiugs, above 4 lines. 



Inhabits the willow, living on the under side of the extremities of the branches. 

 October 1, 1837. 



This species can not be identical with A. salicis Linn., which has the body spotted 

 with white. (Harris' Corr.) 



85. Chaitophorus viminalis Thomas. 



This aphid occurs on the young twigs and leaves of Salix lucida and 

 8. hahylonica in Illinois. 



Apterous individuals. — Varying from pale green to light yellow, with two darker 

 vitta) on the abdomen which are often obsolete. Entire insect covered with long 

 white hair. 



Winged individuals. — Head and thorax black ; abdomen black, except the margins 

 and style, which are yellow. Nectaries a little longer than thick, yellowish, often 

 slightly fuscous. Antennae hairy ; seventh joint filiform, almost as long as the three 

 preceding taken together. Wings hyaline. Length, 1.. 52™"' ; to tip of wings, 2.54'"™. 



86. Chaitophorus smithiai Thomas. 



This aphid lives on the leaves of Salix alba, from May to June, at 

 :Peoria, 111. (Miss E. A. Smith.) 



Winged form. — General color dusky reddish. Wings hyaline; venation very vari- 

 able. Nectaries two-thirds as long as the tarsi, vasiform, contracted at the base, 

 expanding in the middle and again contracted at the apex ; the mouth flaring. 

 Antennae a little over half as long as the body, the third joint the longest, the 

 fourth and fifth subequal, and the sixth joint two-thirds as long as the preceding. 

 Seventh joint slender, very little longer than the preceding. Rostrum reaching the 

 third pair of copoo. Length, 2.28""" ; to tip of wings, 4.56""". 



87. Lachnus dentatua Le Baron. 



Dr. Le Baron describes this species in his second Report on the 

 Insects of Illinois, p. 138. It occurs in great numbers in October and 

 November on the uuder sides of the branches of the gray willow, and 

 also occurs on small nursery apple trees. 



Moth. — Black; abdomen dark ash-colored, with six transverse rows of black dots. 

 Antennae filiform, as long as the head and thorax ; two basal joints, short and stout, 

 the third as long as the three terminal ones united; these three equal. Proboscis 

 greenish yellow at base. Forewings with the usual stout subcostal vein, and a 

 very elongate stigma ; three discoidal veins (exclusive of the stigmatic vein), much 



