196 ERNEST A. BACK. 



a broad median crest of black hair and bristles; legs marked with 

 yellow; wings blackish, in the male the basal portion milky white. 



Face silvery white pruinose with long black bristles; bristles of 

 front and a patch on the occiput directly behind the vertex black; 

 the remaining bristles and pile of the occiput and the pile of the beard, 

 proboscis and palpi pale. Proboscis and palpi polished black. Pro- 

 notum wholly clothed with comparatively fine hair. Mesonotum with 

 a broad median crest of black hair and bristles extending from the 

 pronotum to the scutellum, short in front, longer behind; the lateral 

 margins, including the humeri and posterior callosities, with sordid 

 white hair and bristles; scutellum with a fringe of black bristles; the 

 sternopleurae with a tuft of long pale pile; the hypopleurse entirely 

 bare. Abdomen, including the genitalia, polished black, with com- 

 paratively long, fine, sordid white or yellowish pile, longer on the basal 

 segments and venter. Legs polished black; the tips of the front and 

 middle femora, the basal half of their tibiae, the basal fourth of the 

 hind tibiae and the front and middle tarsi, except the bases of their 

 several segments, yellowish; the entire legs, including the coxae, with 

 sordid yellowish white hair and bristles; pulvilli pale, claws black, 

 yellowish at base. Halteres yellowish-red. Wings uniformly blackish, 

 the basal, anal and axillary cells, except distally, milky white in the 

 male; the first and fourth posterior cells narrowed but open. 



Type. — National Museum. 



Habitat. — Claremont, Cal. 



I have not the original description; the above was drawn 

 from a partially greased specimen, with the antennae missing, 

 kindly loaned me by Mr. Coquillett. It is such a unique 

 species it will be readily recognized. 



Steuopogon breviiisculiis (PI. XII, fig. 3). 



Stenopogon breviusculus Loew, Cent., X, 28, 1872. 



^ 9- — Length 15-19 mm. — Quite readily separated from those 

 species in which the hypopleura is bare and the sternopleura has a 

 tuft of fine hair, by the unusually bristly appearance of the lateral 

 margins and posterior callosities of the thoracic dorsum, by the three 

 brown dorsal thoracic stripes, separated by very pale, almost grayish- 

 white bloom, which also narrowly divides the median stripe, and, when 

 when viewed from above, appears along the lateral margin above the 

 dorso-pleural suture. 



The first segment of the antennae, often the first two, reddish; the 

 third segment about one and three-fourths times as long as the basal 

 sec^ments, black, of nearly equal width, not excised within distally; 

 style about one-third as long as the third segment. Legs reddish; the 

 femora above, except at apex, black; the black of the hind femora 



