AMERICAN DIPTERA. 351 



Saropogon hyalinus. 



Saropogon hyalinus Coquillett, Proc. Ent. Soc. Wash., VI, 185, 



1904. 



cf 9- — -"Length 13 mm. — Very similar to luteus, except that the 



mesonotum is rather densely yellowish-gray pruinose and marked with 



three brown stripes, and the wings are pure hyaline." There are two 



scutellar bristles. 



Type.—\J. S. N. M., Cat. No. 8037. One male and one 

 female. 



Habitat. — Los Angeles Co., Cal. (Coquillett). 



Saropogon luteus. 



Saropogon luteus Coquillett, Proc. Ent. Soc. Wash., VI, 185, July, 

 1904. 



Saropogon rufus Back, Can. Ent., XXXVI, 290, Oct., 1904. 

 $ 9- — Length 11-17 mm. — Reddish-yellow; apices of antennas, tip 

 and upper side of proboscis, front and occiput of head, a line on the 

 distal margin of the trochanters and the claws black; all the hair and 

 bristles yellow; mystax whitish. Head, except on the vertex, golden 

 pruinose, pleurae and thorax in front of the humeri also golden pruinose, 

 but less densely so; scutellum with two bristles. Abdomen slender, 

 polished, nearly bare; posterior lateral margins of segments 2-5 yel- 

 lowish pruinose. Wings hyaline, slightly fuscous along the brown 

 veins and in the costal cell; fourth posterior cell rather broadly open. 



Type.—U. S. N. M., Cat. No. 8036. Type series consists of 

 three males and three females. The type of rufus, the descrip- 

 tion of which was in press at the time of the publication of 

 luteus, is in the collection of Prof. C. W. Johnson, Curator of 

 the Boston Society of Natural History. 



Habitat. — Los Angeles Co. (Coquillett, June), and Tehachapi 

 (A. P. Morse, Aug. 2), Kern Co., Cal. 



This species may be distinguished from the other species by 

 its much slenderer abdomen and uniformly reddish color. 



Saropogon semiustus. 



Saropogon semiustus Coquillett, Proc. Ent. Soc. Wash., VI, 186, 



July, 1904. 

 Saropogon albifrons Back, Can. Ent., XXXVI, 291, Oct., 1904. 

 $ 9- — Length 10 mm. — Black, slender; the abdomen, except the 

 first segments and the apices of the femora, reddish-yellow; all the 

 hairs and bristles of entire body whitish. Head everywhere white 

 pruinose; thorax densely grayish pruinose. Third segment of antennae 

 tapering from the middle to the tip, one and one-fourth times as long 

 as the first two; the style very small. Scutellum with two bristles; 



TRANS. AM. ENT. SOC, XXXV. AUGUST, 1909 



