170 NEW YORK STATE MUSEUM 



Gall. The affected leaves form a fusiform pod some 10 mm 

 long, 2 mm in diameter (pi. 9, fig. 2) and contain several large, deep 

 orange larvae. The apex may be more or less discolored. 



Larva. Length 2.5 mm, deep orange. 



Male. Length 1.5 mm. Antennae nearly as long as the body, 

 thickly haired, fuscous yellowish, basally with silvery hairs ven- 

 trally ; 16 segments, the fifth with a stem as long as the basal en- 

 largement, which latter has a length about one-quarter greater 

 than its diameter; terminal segment produced, with a length over 

 twice its diameter and tapering from the basal third to an irregu- 

 larly rounded apex. Palpi ; the first segment short, stout, with a 

 length about twice its diameter, slightly expanded distally, the sec- 

 ond about as long, stouter, the third one-quarter longer than the 

 second, more slender, the fourth one-half longer than the third; 

 face with patches of short, silvery hairs. Mesonotum dark brown, 

 the lateral and submedian lines distinct and rather thickly clothed 

 with long, pale brown hairs. Abdomen dark brown dorsally, silvery 

 laterally, pleurae with patches of silvery hairs interrupted beneath. 

 Wings hyaline, costa dark brown. Halteres pale yellowish. Coxae 

 pale yellowish with silvery hairs, femora pale silvery at base, fus- 

 cous apically ; tibiae and tarsi darker ; claws long, stout, strongly 

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

 clasp segment long, stout ; terminal clasp segment stout at base ; dor- 

 sal plate short, broad, divided; ventral plate short, stout, deeply 

 and triangularly emarginate; harpes long, stout, tapering, irregu- 

 larly tuberculate. 



Female. Length 2 mm. Antennae extending to the second ab- 

 dominal segment, sparsely haired, fuscous yellowish; 15 segments, 

 the fifth subsessile, subcylindric, with a length one-half greater than 

 its diameter ; terminal segment produced, with a length fully three 

 times its diameter, the distal portion tapering to an obtuse point. 

 Palpi ; the first segment stout, slightly expanded distally and with a 

 length about twice its diameter, the second as long as the first, more 

 slender, the third one-half longer than the second, more slender 

 and the fourth a little longer and more slender than the third 

 Ovipositor nearly as long as the abdomen, the terminal lobes rather 

 long, slender, narrowly rounded. Type Cecid. ai675. 



Dasyneura gibsoni Felt 



191 1 Felt, E. P. Econ. Ent. Jour., 4:479 



Specimens of this midge were reared from flower heads of 

 Canada thistle, Cirsium arvense, collected by Arthur Gibson 

 in the vicinity of Ottawa, Canada, in August 191 1. The larvae 

 occur here and there among the florets and, according to Mr Gibson, 

 are of material service in checking this weed. Specimens of the 

 same species were received from Dr Fernandus Payne of Indiana 

 University, Bloomington, Ind., accompanied by the statement that 



