AMERICAN DIPTERA. 289 



Cyrtopogon rejectus. 



Cyrtopogon rejectus Osten Sacken, West. Dipt., 307, 1877. 

 " 9- — -Length 9-10 mm. — First abdominal segment white pruinose 

 on the sides only; the white cross-bands on segments 2-4 interrupted; 

 on segment 5 the extreme sides only of the hind margin are white. 

 Median geminate thoracic stripe less well marked and abbreviated 

 earlier posteriorly; the portion of the lateral stripe anterior to the 

 transverse suture is well marked, brown." 



Type. — M. C. Z. Four female specimens. 



Habitat.— -Webber Lake, Sierra Co. (July 22-24), and Sum- 

 mit Station, Central Pacific Railroad (July 17), Cal., Osten 

 Sacken. 



Head wholly grayish pruinose, occiput and thorax wholly 

 brownish-yellow pruinose; viewed from above, the scutellum, 

 posterior callosities and the dorsum behind the abbreviated 

 geminate stripe lighter pruinose. Abdomen as above de- 

 scribed, almost bare; the white pile on the side of the segments 

 not prominent, longest on segments 1 and 2. Trichostical pile 

 white. Legs wholly black, clothed with black bristles and 

 pile with the exception of some white pile on the femora be- 

 low. Pile of dorsum and scutellum black. Wings hyaline on 

 the proximal half, slightly tinged with grayish on the distal 

 half. 



Osten Sacken says that " rejectus alone is doubtful to me, 

 and may possibly be only a variety of evidens." 



Cyrtopogon litigator (PL X, fig. 6). 



Cyrtopogon nugator Osten Sacken, West. Dipt., 307, 1877. 



Cyrtopogon nugator Williston Tr. Am. Ent. Soc, XI, 13, 1884. 

 % 9- — Length 7-8 mm. — "First abdominal segment white pruinose 

 on the sides only; the white cross-bands on segments 2-5 very markedly 

 interrupted; length of the interruption nearly equal on segments 2-4. 

 The abdomen ( 9 ) is narrower, more cylindrical and convex, of more 

 equal breadth from the base than in the female of evidens and rejectus. 

 Wings almost uniformly hyaline. Thoracic stripes very distinct, more 

 blackish; the portion of the lateral ones preceding the suture is not 

 conspicuously darker, and has not the rich dark brown color which 

 distinguishes it from evidens and rejectus. Claws whitish-yellow, the 

 tips black. In size, this species is smaller, the female being only 7-8 

 mm. long. I have a male specimen which seems to belong here on 

 account of its size and hyaline wings; but the stripe on the second 



TRANS. AM. ENT. SOC, XXXV. (37) AUGUST, 1909 



