228 THE CANADIAN ENTOMOLOGIST 



antennal segments and the short, greatly swollen terminal clasp 

 segment. 



Male. — Length 2 mm. Antenna? a little longer than the body, 

 sparsely haired; 16 segments, the fifth with a stem twice the length 

 of the basal enlargement, which latter has a length one-half greater 

 than its diameter; terminal segment reduced, with a length nearly 

 three times its diameter and tapering almost uniformly to an acute 

 apex. Palpi reddish, first segment with a length four times its 

 diameter, second a little shorter, stouter, the third longer than the 

 second, more slender and the fourth one-half longer than the 

 third. Mesonotum shining dark brown. Scutellum and post- 

 scutellum yellowish. Abdomen yellowish white, with narrow^ 

 double, transverse, brownish sclerites on each abdominal segment, 

 the distal segments tinged with reddish. Genitalia fuscous yel- 

 lowish. Halteres and coxa? pale yellowish. Legs mostly a \ari- 

 able straw; claws rather slender, strongly curved, unidentate, the 

 pul villi as long as the claws. Genitalia; basal clasp segment short, 

 stout; terminal clasp segment short, greatly swollen near the 

 middle and with a length hardly one-half greater than the diameter; 

 dorsal plate rather long, deeply and roundly emarginate, the lobes 

 broadly rounded; ventral plate moderately long, liroad, deeply 

 and triangularly emarginate, the lobes tapering to a roundly 

 truncate apex. Harpes short, stout, irregular, heavily chitinized. 

 Type Cecid. L564. 

 Asteromyia sylvestris, n. sp. 



The yellowish or brownish blister leaf galls of this species 

 were very abundant October 22, 1914, on Aster cordifoliiis at 

 Mount Kisco, N. Y. A number of adults were reared together 

 with several parasites, the latter undetermined. 



Gall. — Diameter three to four mm., circular, a variable yel- 

 lowish or brownish blister leaf gall on Aster cordifoliiis. Some are 

 yellowish with brown centres and others mostly dark brown. 

 There may be three to twenty on a leaf and the larvcie evidently 

 hibernate in the gall, though adults appeared under insectary 

 conditions in mid-winter. 



Male. — Length 1.6 mm. Antenna? extending to the base of 

 the abdomen, sparsely haired, reddish brown; 16 segments, the 

 fifth with a length one-fourth greater than its diameter; terminal 



