326 ERNEST A. BACK. 



and femora except the apex, black; apical third of first abdominal 

 segment and the apical three-fourths of the second segment, reddish 

 in the female but black in the male. Style one and one-fourth times 

 as long as the third antennal segment. Wings smoky-brown, lighter 

 on the base as far as the furcation of the second and third veins; a 

 lighter transverse shade passes through the middle of the discal cell. 

 Front metatarsi of the male densely covered with appressed white 

 hairs above." 



Type. — U. S. N. M., Cat. No. 10425. A single male specimen 

 and a single female specimen. 



Habitat. — Texas (type, H. K. Morrison). 

 I have not studied this species. 



Heteropogoii plioenicurus. 



Heteropogon phcenicurus Loew, Cent., X, 33, 1872. 

 Heteropogon phcenicurus Howard, Insect Book, PI. XIX, fig. 12. 



(^ 9- — Length 9-12 mm. — Black; apex of abdomen reddish; the 

 tibiae and tarsi brown or reddish; the basal half of the wings, except- 

 ing the extreme base, hyaline; apex black. 



(^. — Black; the posterior margin of the fifth abdominal segment, 

 the whole of the following ones and the hypopygium deep rufous; the 

 tibiae and tarsi brown, the segment of the latter blackish toward the 

 apex. Front covered with brownish bloom and black pilose. Face 

 densely grayish pruinose in sharp contrast to the brown of the front; 

 the lower part of the mystax wholly black, above mixed with black 

 and whitish pile, the latter toward the oral margin sometimes very 

 pale yellow. Antennae black; more slender than in many European 

 species and with a longer style. Occipital orbits with long black 

 bristles; the whole occiput, mentum and base of proboscis with very 

 long and very dense white pile. Thoracic dorsum subpolished, ex- 

 cepting the three usual very broad vittae, covered with pale yellowish, 

 sometimes almost whitish, bloom; whole dorsum white pilose except 

 the pile on the humeri and the bristles above the base of the wings, 

 which are black. Pleurae and scutellum white pruinose; the margin 

 of the latter on each side with a single black, rarely white, bristle. 

 Pile of tergum of abdomen very short, black; thence from the pos- 

 terior margin of the fifth segment, reddish; on the hypopygium of the 

 male longer and more dull; the lateral margins of the abdomen are 

 clothed with long white or very dilate sordid yellow or whitish pile 

 which greatly decreases toward the tip of the abdomen and changes 

 its pale color to reddish. Venter grayish, clothed with long whitish 

 pile. Femora polished black, with short black pile, both sides of the 

 base with black bristles, but below more broadly clothed with long white 

 pile, in the middle below near the apex with dense black pile. Tibiae 

 reddish, the extreme apex of all a little darker; the front pair with short 



