AMERICAN DIPTERA. 205 



cell closed before the margin of the wing. The wings of the male are 

 shorter than those of the female, and with shorter submarginal cells. 



Type.—M. C. Z. 



Habitat. — Nebr. (type), Pierre, S. D. (J. M. Aldrich) ; Rocky 

 Ford, Col. (July 4); Sioux Co., Nebr., (P. R. Jones). 



The antennae of both consangiiinens and latipennis are sim- 

 ilar; the third segment is much longer than the two basal 

 ones, about two times as long as the rather thick short style, 

 and flattened on the distal half, thus from certain positions 

 a-ppearing tapering toward the tip from about the middle. 



Both species have a small amount of hair on the hypopleurae 

 before the halteres. The thorax of consanguineus is more 

 grayish pruinose and the bristles of the occiput and thorax 

 more nearly white. 



Mr. Jones states that this species is common in northwestern 

 Nebraska in the fall. 



Steuopogoii latipennis (PL III, fig. 1). 



Stenopogon latipennis Loew, Cent., VII, 49, 1866. 



9. — Length of body 18—19 inm..; of wing about 12.5 mm. — Translation. 

 — Ochraceous; head, pro thorax, spots of pleurae, the three dorsal 

 stripes of the thorax and the metonotum black, but clothed with a 

 luteus bloom, wings rather broad, subfuscous, costa and the proximal 

 veins ochraceous, second submarginal cell rather shorter, fourth pos- 

 terior cell closed before the margin of the wing. 



Very much like consanguineus, but larger and more robust, front a 

 little narrower, wings broader and femora stouter. Antennse black, 

 thorax ochraceous; prothorax, spots of pleurae, metanotum and the 

 three dorsal stripes black, opaque, clothed with dense luteus bloom. 

 The entire abdomen ochraceous, the posterior margins of the last 

 segments sometimes blackish. Posterior coxse ochraceous with black 

 spots. Legs wholly ochraceous, the pile and all the bristles luteus. 

 Wings rather broader, subfuscous; costa and costal veins ochraceous, 

 second submarginal cell rather shorter, fourth posterior cell closed be- 

 fore the margin of the wing. 



Type.—M. C. Z. 



Habitat. — Western Texas (type); Dallas, Tex.; N. M.; Den- 

 ver, Col. (?). 



There are at the M. C. Z. a single male and female, and at 

 the Nationl Museum a male, all from Texas, which I regard 

 as typical of this species. The wings of these are broader, 



TR.\.\'S. AM. ENT. SOC, XXXV. JUNE, 1909. 



