AMERICAN HYMENOPTERA. 115 



domen shining, almost impunctate ; no pygidial area. Color black; 

 mandibles flavo-testaceous; sometimes there is a yellow spot on the 

 tubercles; tarsi brownish, sometimes reddish-brown. Face, clypeus 

 and mesopleurae with conspicuous silver pile. Wings hyaline, irides- 

 cent; venation dark brown. 



Male. — length 3.5 mm. Very much like the female, but differs in 

 the absence of the acute median tooth of the clypeus; the third anten- 

 nal joint is a little shorter than the fourth; the metanotum with a few 

 basal striae, and the tarsi are usually orange-red. 



Habitat.— Florissant, Colorado, June 19, 1908 (S. A. Roh- 

 wer). Caught while flying over sandy soil in a dry creek bed, 

 and under bushes of a wild gooseberry (Ribes vallicola). 



A very distinct species, easily recognized by the short sub- 

 median cell, and the testaceous mandibles. Dedicated to the 

 pioneer entomologist Thomes Say. 



Niteliopsis niger n. sp. 



Female. — Length 4.5 mm. Clypeus with a shining, obtuse, median 

 tooth; sides rounded. Head coarsely granulate; frontal carinas not 

 apparent. Ocelli in a little less than an equilateral triangle; no furrow 

 from the anterior ocellus. Antenna? hardly reaching to the tegulae; 

 joints three and four equal. Prothorax lower than the dorsulum, not 

 notched in the middle. Dorsulum and scutellum closely, distinctly 

 punctured; scutellum not impressed. Metanotum granular, with a 

 distinct median carina; metapleurae and posterior face granular; pos- 

 terior face with an indistinct fovea. Radial cell appendiculate; first 

 recurrent nervure a very little basad of the first tran. cu.; second 

 recurrent nervure beyond the middle of second cubital cell; tran. med. 

 and basal almost interstitial. Abdomen smooth, shining, impunctate; 

 pygidial area poorly defined. Color black; face with a little silvery 

 pile. Wings dusky hyaline; venation brown. 



Male. — Length 4 mm. Clypeus with a very small acute median 

 tooth; middle carina almost wanting. Head not so coarsely granular 

 as in female; frontal carinas wanting. First recurrent nervure farther 

 from first tran. cu. than in female. Middle carina of the metanotum 

 is not so strong as in female. Otherwise the above description should 

 apply to the male. 



Habitat. — Florissant and Boulder, Colorado. The Floris- 

 sant specimens were taken June 14 to 19, 1908; the Boulder 

 ones June 1 and August 4, 1908 (S. A. Rohwer). A male and 

 female from Florissant were chosen as the types. This is a 

 very distinct species, easily known from all except modestus 

 by being entirely black. 



TRANS. AM. ENT. SOC, XXXV. MARCH, 1909. 



