208 ERNEST A. BACK. 



Steiiopogoii (Scloropojjoii) ciiierasoeiis n. sp. 



^. — Length about 15 Dim. — Everywhere thinly whitish pruinose, 

 with white bristles and hair; the hypopleurse with a patch of short 

 trichostical hair, the sternopleurse with sparse short pile; the basal 

 segment of the antennae reddish, the second and the third black, the 

 third comparativley short, elongated oval, and about one-third longer 

 than the bristle-like style. Palpi and proboscis black. Wings short, 

 not reaching but little beyond the tip of the fourth abdominal segment, 

 hyaline, slightly darkened at tip; the first and fourth posterior cells 

 closed and petiolate. Scutellum with but three bristles on each side 

 of the posterior margin. x\bdomen elongate, the hair throughout very 

 short, appressed; genitalia black. Legs black, thinly white pruinose 

 and clothed with white hair and numerous white bristles; claws black, 

 slightly yellowish at base. 



Type. — Brooklyn Institute. A single male in excellent con- 

 dition. 



Habitat. — Brownsville, Tex. (July 29). 



There are suggestions of reddish markings in the ground 

 color of the femora, base of the tibiae, portions of the coxae, 

 pleurae, face and genitalia, but these are almost wholly con- 

 cealed beneath the whitish bloom of the perfect specimen of 

 this unique species. 



Steiiopogou (Scleropogon) helvolu.s (PI. Ill, fig. 3). 



Scleropogon helvolits Loew, Berl. Ent. Zeit., 1874, 355. 



Scteropogonhelvolus Jones, Trans. Am. Ent. Soc. Phila., XXXIII, 

 273, 1907 (note). 



Scleropogon helvolus Howard, Insect Book, 1902; PI. XIX, 

 fig. 16. 

 ,-f 9- — Length of body 20-23 mm.; of wing 12-13 mtn. — A honey- 

 yellow or flesh-colored species wholly clothed with a thin grayish-white 

 bloom; basal segments of antennae reddish-yellow, the third dark — 

 usually black — elongate oval, with a terminal style more than one- 

 half as long; hypopleurae with distinct short trichostical bristles; 

 sternopleurae with patch of fine hair; first and fourth posterior cells 

 in the five specimens examined closed and petiolate; all the femora 

 above with obscure black markings. Mystax, beard and bristles of 

 coxae white; the bristles of the rest of the body more sordid. 



"Chamois-leather yellow or cream-yellow, which in some specimens 

 verges somewhat toward buckskin-brown, everywhere with a more 

 whitish bloom, in special darker specimens more yellowish on the 

 tibiae." — Loew. Some specimens appear almost wholly flesh-colored, 

 in others the thorax is darker; the bloom of the face is very white, that 

 of the rest of the body more grayish, but can hardly be said to obscure 



