122 NEW YORK STATE MUSEUM 



four and five times their diameters, respectively; terminal seg- 

 ment, distal enlargement produced, tapering apically to a long, stout, 

 spindle-shaped appendage. Palpi; the first segment long, irregular, 

 the second one-half longer, stout, subrectangular, the third one-fourth 

 longer than the second, more slender, the fourth as long as the third, 

 somewhat dilated. Mesonotum dark brown, the submedian lines 

 indistinct. Scutellum reddish brown, postscutellum probably red- 

 dish brown. Abdomen light yellowish and with a dark fuscous 

 spot dorsally on the third and fourth abdominal segments. Genitalia 

 slightly fuscous. Wings long, slender; costa light brown; halteres 

 pale yellowish. Legs a variable yellowish white; claws long, slender, 

 strongly curved, the pulvilli as long as the claws. Genitalia; basal 

 clasp segment very long, slender; an obtuse triangular basal process; 

 terminal clasp segment long, greatly swollen basally; dorsal plate 



Fig. 40 Thecodiplosis querci- 

 folia, fifth antennal segment of male 

 (enlarged, original) 



short, stout, deeply and roundly emarginate, the lobes rather broadly 

 rounded. 



This species, in the prolongation of the setae and circumfili on 

 the ventral face of the antennae, suggests a relationship with Bremia. 

 There is, however, no trace of a low basal circumfilum found in this 

 genus and, moreover, the claws, so far as we are able to ascertain, 

 are simple. The midge is remarkable for the greatly prolonged 

 antennae, due largely to an extension of the stems separating the 

 enlargements. The wings are unusually long and slender and the 

 same is true of the basal clasp segment. Type Cecid. 1015. 



