

OF WASHINGTON. 177 



edge bearing about a dozen long bristly hairs, the apex deeply emarginate 

 and with a short style in the middle of the emargination ; proboscis about 

 two and one-half times as long as the head, palpi slender and linear, 

 reaching about to base of the third antenn.il joint. Head, thorax and 

 scutellum very thinly grayish pruinose, the mesonotum with a median 

 and lateral vitta of lighter gray. Wings grayish hyaline, tinged with yel 

 lowish toward the base and costa, apical half of subcostal cell yellow, small 

 cross-vein slightly beyond middle of discal cell, last section of fifth vein 

 longer than the preceding section. Length 5 mm. 



Head of Rio Piedres Verdes, Sierra Madre, Chihuahua, 

 Mexico, August 16 (C. H. T. Townsend). A male. specimen. 

 Type. No. 8024, U. S. National Museum. 



Family THEREVID^E. 



Psilocephala aurantiaca, n. sp. 



Black, the base of the third antennal joint, halteres, apices of femora, 

 and the tibiae except their apices, dull yellow; palpi pale yellow, segments 

 2 to 5 of abdomen and the apex of the first reddish yellow ; frontal triangle 

 and face silvery white pruinose ; third joint of antennae stibequal in length 

 to the first two and about twice as wide, less than twice as long as wide; 

 thorax somewhat opaque, grayish pruinose, not distinctly vittate, its hairs 

 golden yellow, those on lower part of pleura and in front of the halteres 

 white; scutellum gray pruinose, bearing two bristles; abdomen polished, 

 the hind angles of the first segment and hind margins of the second, third, 

 fifth and sixth segments, white pruinose, hj'popygium rather large; 

 wings hyaline, somewhat grayish along the costa, stigma brown, fourth 

 posterior cell broadly open. Length 5.5 mm. 



Claremont, Cal. A male specimen collected by Prof. C. F. 

 Baker. 



Type. No. 8035, U. S. National Museum. 



Family ASILID^. 

 Leptogaster virgatus, n. sp. 



Readily recognized by the three polished vittae on the otherwise prui 

 nose mesonotum. Head black, grayish pruinose, antennae yellow, the 

 arista black, mystax and the slender bristles on upper part of occiput 

 white; thorax reddish brown, light gray pruinose except three polished 

 vittse on the mesonotum :, abdomen black, brownish pruinose, the first 

 segment and both ends of the others light gray pruinose; legs yellow, a 

 broad band before apex of hind femonx and apical half of hind tibiae brown, 

 apices of tarsi yellowish brown, empodia spine-like, about half as long as 

 the claws; wings hyaline, the apex narrowly gray, base of fourth pos 

 terior cell with a long peduncle. Length 13 mm. 



