202 ERNEST A. BACK. 



whitish; the red of the fore femora is quite variable in extent, 

 sometimes covering the whole lower half, and again found 

 only toward the tip. In all the specimens examined the second 

 segment of the abdomen above is wholly reddish except for 

 a black spot in the middle on the basal half which may be 

 large or hardly noticeable ; all the segments laterally are nar- 

 rowly margined with black, and the posterior angles of seg- 

 ments 2-5 are narrowly covered with a whitish bloom, which 

 in some specimens is hardly perceptible. Venter wholly black. 

 The fourth posterior and anal cell closed at the margin, the 

 others wide open. 



This species is very closely related to the species of Ospri- 

 ocerus, but the short terminal style of the antennae prevents 

 its location in that genus. It seems to be an intermediate 

 form. 



Steuopogon niteiis. 



Stenopogon nitens Coquillett, Jour. N. Y. Ent. Soc, XII, .34, 

 1904. 

 cf . — ''Length 16 mm. — Distinguished by the poHshed black abdomen. 

 Black; the halteres whitish; pul villi yellow, with two brown vittae; 

 tarsal claws reddish at base; hairs and bristles whitish, those on the 

 antennae, front, middle of mesonotum, abdomen except the first two 

 segments and on the legs except the coxae black; pubescence on inner 

 side of the fore tibi© golden yellow, hairs on lower side of fore femora 

 chiefly whitish; mesopleura bare, hypopleura hairy; third segment of 

 antennae rather slender and elongate, about sixteen times as long as 

 the style; head and thorax grayish pruinose, the mesonotum, except 

 along the sides and posterior end, somewhat polished; abdomen pol- 

 ished, a transverse white pruinose streak in hind angles of segments 

 2-5; wings blackish, tinged with yellowish in the costo-basal portion, 

 veins black, first posterior cell considerably narrowed at the apex, the 

 fourth closed at the margin." 



Type. — Brooklyn Institute. A single male specimen. 

 Habitat. — Southern Texas (May). 



Steiiopogoii siibulatus. 



Dasypogon subulatus Wiedemann, Auss. Zw., I, 375, 1828. 



cf 9 . — Length 20-22 mm. — Wings broad, uniformly brownish or 

 blackish, abdomen and legs reddish-yellow, the fore and middle femora, 

 and sometimes the hind femora, with black vittae above. 



Reddish-yellow; face, front and occiput yellowish-gray pruinose; 



