AMERICAN DIPTERA. 349 



black with white pile. Thorax densely grayish- white pruinose, tinged 

 with yellow on the dorsum; the geminate and lateral stripes on the 

 latter opaque, and appear but faintly. Pleurae with no pile; the tri- 

 chostical bristles long and fine. Scutellum with four bristles; bristles 

 and pile of entire thorax whitish, the bristles on the whitish pruinose 

 coxag rather fine. Halteres dull yellow, knobs dark. Abdomen reddish, 

 polished, the posterior lateral margins of segments 1-5 white pruinose : 

 anterior to each of these pruinose spots on segments 3-5 is a black 

 spot ; on segment 3 small, but larger on segments 4 and 5; these some- 

 times extend upward along the anterior margin of their respective 

 segments and meet on the tergum. There is a slight trace of a black 

 spot between the white bloom on segment 1. Venter black; segments 

 1 and 2 reddish; the posterior margins of segments 2-4 whitish pruin- 

 ose. Hypopygium black, with black and white pile; rest of abdominal 

 pile fine, white, longer on the sides. Legs black; the distal portion of 

 all the femora, the outer basal half of the tibiae and the tarsi yellowish- 

 red; the tarsi often brownish- red. Femora without bristles, with fine 

 silky white pile, shorter above, longer below; the pile and bristles of 

 the tibiae more yellowish; those of the tarsi reddish-brown. Claws 

 black, reddish at extreme base; pulvilli pale. Wings nearly hyaline, 

 slightly darkened toward the tip; fourth posterior cell open. 



9 - — Differs from the male in that the antennae, except tip, and the 

 legs except the tips of the tibiae and of the tarsal segments, are yel- 

 lowish-red. Segments 3-5 of the abdomen have the same black areas 

 before the pruinose spots, but these are confined to the sides, and do 

 not extend upwards to meet over the tergum. 



Type.—JJ. S. N. M., Cat. No. 10329. One male and one 

 female. There is also a male metatype at the American Mu- 

 seum. 



Habitat.— Lsis Cruces, N. M. (C. H. Townsend, Aug. 23); 

 Laredo, Tex. (Aug. 7). 



In general appearance coquillettii more closely resembles 

 semiustus, hyalinus and luteus, but can be at once separated 

 from them by its possession of four, instead of two, scutellar 

 bristles. It can be separated from combustus and dispar by 

 its more slender build, smaller size, and nearly hyaline udngs. 



I take pleasure in naming this species in honor of Mr. D. W. 

 Coquillett as an acknowledgment of my appreciation of the 

 help which he has willingly given me. 



Saropog-on dispar (PI. VII, fig. 4; PI. VIII, fig. 2). 



Saropogon dispar Coquillett, Jour. N. Y. Ent. Soc, X, 139, 1902. 



(^ 9- — Length 20-23 mm. — Male. — Black; face and front silvery 



pruinose; thoracic dorsum with three broad black stripes; femora with 



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



