204 ERNEST A. BACK. 



segments, at the middle rather suddenly tapering toward tip due to a 

 depression or a flattening of the distal half, about twice as long as the 

 short, thick style. Wings subopaque, of a dull yellowish-gray color; 

 veins yellowish, the first posterior cell wide open, the fourth usually 

 closed at the margin or slightly petiolate. 



Type. — M. C. Z. Homotype, University of Kansas. 



//a6i/a^— Dallas, Tex.; Mesilla Park (May 8), Mesilla Val- 

 ley, and Alamogordo, N. M.; Ariz. (June 9). 



Very closely resembling consangineus , but a little larger, 

 more graceful, the thorax narrower, and the abdomen both 

 narrower and longer; the wings are longer and less broad and 

 of a deeper fuscous tinge. On the whole consangineus appears 

 less bristly. The contrast between the black thorax and red- 

 dish abdomen is best brought out in greased specimens. The 

 black vittae of the front and middle femora are very limited, 

 those on the latter often being wholly lacking; the vittae of 

 the posterior femora usually very narrow, but sometimes 

 broadening out to cover the entire anterior and upper surfaces. 

 The thoracic dorsum in darker specimens show a faintly 

 divided median and two lateral, very obscure, brownish stripes. 

 Bristles of entire body white or sordid white ; those on vertex 

 and legs more yellow. 



Steiiopogou cousauguiueus. 



Stenopogon consanguineus Loew, Cent., VII, 48, 1866. 



Stenopogon consanguineus Jones, Trans. Am. Ent. Soc. Phila., 

 XXXIII, 274, 1907 (locality note). 

 (^ 9- — Length of body 14-15 mm.; of (^ wing 9.5 mm.; of ? wing 

 11.3 mm. — Ochraceus; thorax, except the humeri, black, bloom dense, 

 luteus, opaque; lateral vittae of the abdominal segments and of the 

 femora black; wings subfuscous, costa and veins on proximal portion 

 of wing ochraceus, second submarginal cell rather shorter, fourth pos- 

 terior cell closed before the margin of the wing. 



Ochraceus; head black, but with dense very pale flavous bloom. 

 Antennae black. Mystax and pile of the entire head sordid yellowish- 

 white. Thorax, except the humeri, black, but covered with a dense 

 luteus bloom, opaque, dorsum covered with short pile and sordid 

 yellowish-white or whitish bristles. Abdomen ochraceus, the sides of 

 the segments black, the posterior margins for the most part excepted. 

 Legs ochraceus, femora with black vittas above, all the bristles yellow- 

 ish-white; hind tibiae occasionally brownish beneath. Wings sub- 

 fuscous, the centers of the posterior cells paler; the fourth posterior 



