284 ERNEST A. BACK. 



antennae; third joint of antennas one and one-fourth times as long as 

 the first two taken together, gradually tapering to apex, three times as 

 long as the robust style; hairs of front and on upper edge of occiput 

 chiefly black, on remainder of occiput whitish. Thorax with the 

 usual brown markings, a median crest of rather long black hairs, 

 bristles black and rather slender; mesopleura and sternopleura hairy, 

 pteropleura bare, hairs of hypopleura whitish; scutellum strongly con- 

 vex, yellowish-gray pruinose, rather densely covered with long white 

 hairs and with a row of slender black bristles around the margin. Ab- 

 domen polished, the lateral margins narrowly gray pruinose, produced 

 inward a short distance at the hind angles of each segment Hairs 

 and bristles of legs chiefly whitish; tarsal claws black. Wings hyaline, 

 a distinct brown cloud on veins and cross-veins near middle of discal 

 cell." 



Type.—U. S. N. M., Cat. No. 7958. A single female spec- 

 imen. 



Habitat.— Pullman, Wash. (April 29, 1902, Prof. C. V. 

 Piper). 



Cyrtopogoii nigricolor. 



Cyrtopogon nigricolor Coquillett, Proc. Ent. Soc. Wash., VI, 183, 

 1904. 

 " °. — Length 9 mm. — Near rattus, but the bristles of the tibiae are 

 black, the abdomen is largely polished, etc. Black; the halteres yel- 

 lowish; the knees narrowly brownish-yellow. Hairs of the front whit- 

 ish, on the vertex mixed with black; bristles of upper part of occiput 

 black, hairs of the lower part white; mystax mixed white and black, 

 mounting nearly to the antennae; face strongly convex; first joint of 

 antennae slightly longer than the second, the latter with a pair of 

 stout black bristles on the under side; third joint one and one-fourth 

 times as long as the first two taken together, strongly constricted a 

 short distance beyond the base and considerably narrowed at the 

 apex, about three times as long as the slender style. Bristles of the 

 body and on the tibiae and tarsi, black. Brown stripes of mesonotum 

 diffuse, the hairs sparse and rather short; mesopleura, pteropleura and 

 sternopleura bare, hairs of hypopleura chiefly black; scutellum flat, 

 yellowish-gray pruinose, almost bare, with six strong marginal bristles. 

 Abdomen polished, sides of first segment, bases and hind angles of the 

 three following ones gray pruinose (the remaining segments may also 

 have had similar markings, but these do not now appear, possibly 

 owing to the partial greasing of the specimen). Tarsal claws black. 

 Wings hyaline, the apical half faintly tinged with yellowish; small 

 cross- vein slightly beyond middle of discal cell." 



Type.—U. S.N. M., Cat. No. 7956. A single female specimen. 

 Habitat. — Los Angeles Co., Cal. (June, D. W. Coquillett). 



