32 BULLETIN UNITED STATES GEOLOGICAL SURVEY. [TolY. 



iusoct covered ■n'ith long white hair. Winged individuals : Head and thorax black ; 

 abdomen blo.ck, excei^t the margins and style, which are yellow. Nectaries a little 

 longer than thick, yellowish, often slightly fuscous. Antenuiie hairy; seventh joint 

 iiliform, almost as long as the tlu-ee i^receding taken together. Wings hyaline. Length 

 1.52"'''" ; to tip of wings 2.54'""'. 



On young twigs and leaves of Salix hicida and S. hdbylonica. The 

 venation of the wings is exceedingly variable; iii one ahnormal speci- 

 men I have observed a robust transverse vein running from the middle 

 of the second discoidal to the base of the lower branch of the cubitus, 

 thereby forming a closed trapezoidal cell. 



Chaitophorus Smithle, n. s}!. — Winged form: General color dusky reddish. Wings 

 hyaline; venation very variable. Nectaries two-thirds as long as the tarsi, vasiform, 

 contracted at the base, expanding iu the middle, and again contracted at the apex ; 

 the mouth daring. Antennae a little over half as long as the body, the third joint the 

 longest, the fourth and fifth subeqnal, 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 coxae. Length 2.28'°™ ; to tip of wings 4.56'"'". 



On leaves of Balix alba. May — June. Peoria, 111. (Miss E. A. Smith), 

 This species comes under CladoMus Koch, a genus which does not 



seem sufficiently distinct from Chaitophorus. 

 Though the shape of the nectaries is very remarlcable, it seems to me 



scarcely sufficient to justify a generic separation. 



CiiAiTOPHORtJS QUERCiCOLA, n. sp. — Apterous individuals: Dorsum greenish, with 

 four rows of short tubercles, all of which, except a few in the side-rows, are black ; their 

 apical circumference with from three to five bristles ; the two middle rows of tubercles 

 stop at the head, but the two lateral rows are continued by smaller tubercles until 

 near the base of the labrum. Rostrum reaching the second coxse. Nectaries yellow, 

 about as long as the tarsi, slightly enlarged at base, the mouth conspicuously flaring. 

 Style not perceptible. Winged individuals : Antennas very slightly pilose ; fourth joint 

 subequal to the fifth and two-thirds as long as the third joint ; sixth about half as long 

 as the preceding, and very little longer than the seventh. W^ings with the stigma and 

 veins much as in Ch. populicola; the veins lying in naiTOW dusky bands. Length ot 

 apterous individuals 1.52—2.02"""; length of wing 2.54'"'". 



On the under side of the leaf near the midrib. Quercus primts. May — 

 June. Peoria, 111. Of this interesting species, I have seen a number of 

 apterous individuals, but only a single winged specimen, which was 

 mounted on a slide kindly communicated by Miss E. A. Smith of Peoria, 

 111. The dorsum of the winged individual is probably not tubercular, 

 but this cannot be decided with certainty on account of. the manner in 

 which the specimen is mounted. 



Though the antennae of this species are not sufficiently pilose to justify 

 its being placed in ChaitophoruSj its general appearance seems to point 

 to this as its rightful position. 



