516 PROCEEDINGS OF THE ACADEMY OF [1893. 



scape beneath at apex, mandibles in the middle, and the tarsi except 

 basal joint, obscure reddish; abdomen bright red; face, front, clyp- 

 eus and thorax sparsely clothed with silvery pubescence ; abdomen 

 without silvery pile; wings slightly fuscous, iridescent, nervures 

 black; marginal cell obliquely truncate; space between the second 

 and third submarginal cells at the top about equal. Length 8-9 mm. 

 Colorado. 



11. — Tachysphex asperatus n. sp. 



9 . — Anterior margin of the clypeus a little rounded-out, not den- 

 tate laterally; front coarsely granulated ; vertex with strong punc- 

 tures ; space between the eyes at top greater than the length of an- 

 tennal joints 2 and 3 united and less than the length of joints 3 and 

 4 united; first joint of flagellum but little, if anything, shorter than the 

 second; dorsulum coarsely punctured ; metathorax above strongly 

 rugose or rugoso-reticulate, the sides and behind distinctly striated; 

 legs feebly spinose; abdomen above impunctate, the last ventral 

 segment more or less punctured; last dorsal segment with the pygidial 

 area only developed at apex, and then only to a very slight degree, 

 impunctate. Black; mandibles at apex and the tarsi more or less, 

 obscure red ; abdomen bright red ; face, front, clypeus and thorax, 

 sparsely clothed with silvery pubescence; the abdomen with a sparse 

 silvery pile; wings subhyaline, iridescent, nervures testaceous; 

 marginal cell obliquely truncate; the second submarginal cell at the 

 top greater than the third at the same place. Length 8 mm. 



Nevada. The coarser sculpture of the dorsulum and the poorly 

 developed pygidial area will distinguish this species from semirufus, 

 which it greatly resembles. 



12. — Tachysphex antennatus n. sp. 



9 . — Anterior margin of the clypeus truncate, armed with a tooth 

 laterally; front finely granulated; vertex finely and closely punc- 

 tured; space between the eyes at top about equal to the length of 

 antennal joints 2 and 3 united, possibly a little greater ; first joint 

 of the flagellum is long, nearly one-fourth shorter than the second, 

 the flagellum not setaceous; dorsulum finely and closely 

 punctured; scutellum likewise; metathorax above finely granulated, 

 the sides indistinctly striated, the posterior face more distinctly so; 

 legs tolerably well armed with spines; pygidial area scarcely two- 



