New Bonibyliidae. 



BY S. W. WILLISTON. 



The two following genera of Bombyliidfe, of considerable interest, 

 I have been unable to identify with any forms previously described: 



Desmatoneura, gen. no v. 



Origin of the second vein from the third at a distance from the 

 anterior cross-vein nearly equal to twice the length of that vein, 

 and beyond the proximal end of the discal cell; its originis rect- 

 angular, with the anterior angle rounded; four posterior cells pres- 

 ent, all open; anal cell open. Eyes of male separated at vertex by 

 a space about equal in width to the length of the antennae; front 

 large. Antennae small, remote from each other at their root, the first 

 two joints very small, the third with a small bulbous base and an 

 elongated, styliform projection about twice the length of the basal 

 portion, terminating in a very minute bristle and without suture. 

 Face retreating. Proboscis small, concealed within the oral cavity. 

 Mesonotum with a few small bristles on the post-alar callosities and 

 on the sides of the scutellum. Abdomen slender, cylindrical, grad- 

 ually tapering; hypopygium small and mostly concealed. All the 

 tibiae with small bristles; pulvilli distinct. The marginal cell is mod- 

 erately expanded at the extremity. 



The genus is most nearly related to Aplioebanius, which it much 

 resembles, but will be at once distinguished by the origin of the sec- 

 ond vein and by the front. 



Desmatoneura argentifrons, n. sp. 



Male. Front completely covered with a dense, brilliant, yellowish 

 silvery tomentum or dust and with some fine, yellowish white pile, 

 visible from the side; in perpendicular view there is seen a triangular 

 yellow spot in the ground-color, reaching between the margins of the 

 eyes where they begin to diverge. Face with a white dust, only 

 partially concealing the black ground-color, and with short white 

 pile. Antennae black. Mesonotum and scutellum brownish black, 

 opaque, with sparse yellowish tomentum; hair of the pleurae white. 

 Knob of the halteres light vitelline yellow. Abdomen covered with 

 uniform yellowish tomentum and with white pile on the sides and 

 venter. Legs black, the knees yellow; femora and tibiae largely or 



(267) KAN. UNIV. QUAR., VOL. Ill, NO. 4, APRIL, I, 1895. 



