AMERICAN DIPTERA. 289 



Cyrtopogoii rejectiis. 



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." 



Cyrtopogoii iiiigator (PI. 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 m,m.. — ^" 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 



