408 PROCEEDINGS OF TliE NATIONAL MUSEUM vol. 83 



longer than stigmal vein and usually merging with the darkish costal 

 border of the wing, the apex rather indistinct; thorax very distinctly 

 less than 1.5 mm long. 



Abdomen: Posterior face ranging from somewhat wider than long 

 to longer than wide; first tergite petioliform, without an elevated 

 anterior margin or flange and more or less rugosely sculptured, 

 sometimes in large part smooth. 



Color: Black; head grayish black, rarely with a greenish reflection, 

 and sometimes brown, area along inner margins of parapsides very 

 rarely greenish, abdomen sometimes with a greenish reflection 

 beneath; flagellum of antenna grayish brown to ferruginous and more 

 t)r less pale beneath; scape greenish, rarely brown; coxae and femora 

 brown to blackish, the femora, especially the posterior pair, with a 

 greenish tinge and sometimes quite green, their apices sometimes 

 testaceous or reddish; tibiae brown to ferruginous, the anterior pair 

 usually testaceous or reddish except for a stripe above, the posterior 

 and intermediate pairs usually darker with their bases and apices 

 reddish testaceous; tarsi testaceous or reddish; wings hyaline, veins 

 testaceous, usually reddish basally. 



Male. — Length about 1.5-2 mm Similar to female; portion of 

 scape bearing sensorial punctures somewhat broadened apically and 

 occupying between one-tliird and one-half of scape, sensoria fine to 

 moderately coarse and dense. Anterior and intermediate tibiae 

 sometimes entirely testaceous except for a stripe on latter above. In 

 some males the eyes reach the level of base of clypeus. In one male 

 specimen, believed to be this species, the cheeks are somewhat 

 convexly rounded and the head appears rather distinctly transverse. 



2Vi)e.— U.S.N. M. no. 49783. 



Type locality. — Washington, D. C. 



Remarks. — Described from a series of 24 females and 14 males of 

 which the type, allotype, and 33 paratypes are in the United States 

 National Museum. The type is labeled "Washington, D. C"; the 

 allotype, "D. C, Aug. 24, '84." Of the paratypes in the National 

 Museum two females are from Nelson, N. H. (Aug.); one female 

 from Lake George, N. Y. (Aug., J. L. Zabriskie); five females and 

 nine males from Virginia, two of these males from Blacksburg (Sept. 

 and Oct.), the others without definite locality; one male from eastern 

 Florida (Ashmead) ; five females and one male from "West Pt.", Nebr. 

 (Sept., J. C. Crawford, collector); seven females from Riley County, 

 Kans. (Sept., Marlatt); one female from Colorado, from the C. F. 

 Baker Collection; and one male from Fitch's Collection, bearing the 

 number 14978. Of the remaining three paratypes, one female and 

 one male, from Big Island and Mosholu, N. Y. (Sept.), respectively, 

 are in the American Museum of Natural History; and one female 

 from Mount Aivy, Pa. (Sept.), bearing the number 126, is in the 

 collection of the Academy of Natural Sciences of Pliiladelpliia. 



