518 PROCEEDINGS OF THE ACADEMY OF [1893. 



about twice as long as it is broad at the base. Black; scape beneath 

 at apex, mandibles medially and apical joints of tarsi, obscure red- 

 dish; abdomen bright red, with a sparse silvery pile ; front, face and 

 clypeus densely and the thorax sparsely, with silvery pubescence ; 

 wings subhyaline, nervures testaceous ; marginal cell truncate, 

 second submarginal cell at the top wider than the third at the same 

 place. Length 7 mm. 



Colorado. The sculpture of metathorax will readily distinguish 

 this species. 



15. — Tachysphex parvulus Cress. 

 Larrada parvula Cr., Proc. Eut. Soc, Phila., IV, p. 465. $ 

 Larra montana Pattern, 1. c. p. 389; Kohl, 1. c. p. 246. 



$. — Front finely granulated; vertex with exceedingly fine and 

 close punctures; space between the eyes at top decidedly greater than 

 the length of antennal joints 2 and 3 united, about equal tojoints 3 and 

 4 united; anterior margin of clypeus subtruncate, armed with a tooth 

 laterally; antenna?, rather long, the flagellum not thickened medially, 

 the first joint of the latter scarcely one-third shorter than the second; 

 dorsulum very finely and closely punctured ; scutellum likewise ; 

 metathorax above coriaceous or finely granulated, the sculpture of 

 sides indistinct, though evidently finely striated, the posterior face 

 transversely striated ; legs feebly spinose, the emargination of fore 

 femora large. Black; scape and mandibles colored as usual, 

 the tarsi except first joint, reddish ; abdomen bright red, with silvery 

 pile; front, face and clypeus with a tolerably dense silvery pubes- 

 cence, the thorax sparsely so; wings subhyaline, iridescent, nervures 

 testaceous; marginal cell obliquely truncate; width of second and 

 third submarginal cells at the top variable. Length 7 mm. 



Colorado. This species is not the $ of montanm as has been 

 supposed by some authors. 



16. — Tachysphex fumipennis n. sp. 



9 . — Anterior margin of the clypeus slightly produced medially, 

 not dentate laterally; front coarsely and distinctly punctured, ver- 

 tex with strong punctures; the furrow which extends back on the 

 occiput deep, giving the latter an emarginate appearance; space be- 

 tween the eyes at the top much greater than the length of antennal 

 joints 2 and 3 united, about equal to the length of joints 3 and 4; 

 first joint of the flagellum but little shorter than the second; dorsulum 



