114 S. A. ROHWER. 



and basal interstitial. Abdomen finely punctured; no pygidium; a 

 distinct sheath. Color black; mandibles, to small spots on the pro- 

 notum, tubercles, a faint streak on the post scutellum, a small spot on 

 the apex of the four anterior femora beneath, and a stripe on the 

 posterior tibiae yellowish-white ; tarsi reddish-yellow, infuscated; tegulas 

 brownish. Wings dusky hyaline; venation brown. Face, clypeus 

 and mesopleurae with silvery pile. 



Male. — Length 3 mm. The male differs from the female in having 

 the metanotum more coarsely sculptured, the third antennal joint 

 shorter than the fourth, the postscutellum black, all the tibiae with a 

 yellow stripe exteriorly, all the femora black, and the tarsi not in- 

 fuscated. 



Habitat.— Rifle, Colorado, July 3, 1908 (S. A. Rohwer). 

 Caught while flying over dry, hot, sandy soil, in the morning 

 about ten o'clock. 



This species is close to inermis (Cress.), but the markings 

 are not so bright or plentiful; the first recurrent nervure is 

 farther basal of the first tran. cu. ; and there is no triangular 

 area on the metanotum of the male. 



Niteliopsis plenoculoides Fox. 



Male. — The male differs but little from the female. The pronotum 

 is black, the spots on the tegulag are wanting; the tubercles may or 

 may not be yellow; the first recurrent nervure is nearer the first tran. 

 cu. but is still in the second cubital cell; and the submedian is a little 

 longer than the median. 



I have seen males from Fedor, Texas, April 19, 1901 (G. 

 Birkmann); and Boulder, Colo., May 2, 1908 (S. A. Rohwer). 



Niteliopsis sayi n. sp. 



Female. — Length 4 mm. Clypeus with a broad projection the angles 

 of which are sharp; this projection has a sharp median tooth; middle 

 carina not very strong. Head finely, closely punctured, appearing 

 granular; frontal carinas rounded, low, forming a broad V. Ocelli in 

 a subacute triangle; a furrow extending from the anterior ocellus to 

 the apex of the V formed by the frontal carinas. Antennae rather 

 slender, third and fourth joints subequal. Prothorax much below the 

 dorsulum, rounded anteriorly, not notched in the middle. Dorsulum 

 and scutellum dull punctured like the head; scutellum not impressed. 

 Metanotum granular with a median carina; metapleurae and posterior 

 face striato-granular; posterior face with a fovea. Radial cell appen- 

 diculate; first recurrent nervure received a little basad of the tran. 

 cu. ; second recurrent nervure received beyond the middle of the second 

 cubital cell; submedian cell distinctly shorter than the median. Ab- 



