526 PROCEEDINGS OF THE ACADEMY OF [1893. 



differs in the sculpture of metathorax and the form of pygidium. 

 Two specimens from Colorado, I refer with some doubt to this 

 species; they measure 14 mm. 



26. — Tachysphex exsectus n. sp. 



9 . — Anterior margin ot the clypeus in the middle distinctly 

 emarginate and armed laterally with at least two strong teeth ; front 

 very finely and closely punctured; (it is difficult to determine in 

 some species whether the front is punctured or granulated) ; vertex 

 even more finely punctured ; space between the eyes at top about 

 equal to the length of antennal joints 2 and 3 united ; first joint of 

 the flagellum fully one-third shorter than the second ; dorsulum very 

 finely and closely punctured ; scutellum not impressed ; upper surface 

 of metathorax finely granulated, metapleurse finely coriaceous, the 

 posterior face striated; legs rather strongly spinose; pygidial area 

 strongly and sparsely punctured, its length fully two-and-a-half times 

 greater than it is wide at the base. Black; mandibles medially, 

 scape beneath at apex and the tarsi reddish (the tibia? are sometimes 

 indistinctly reddish) ; abdomen with a sparse silvery pile, the first 

 three segments red; wings pale subhyaline, iridescent, nervures tes- 

 taceous; marginal cell obliquely subtruncate; width of the second 

 and third submarginal cells at the top about equal; front, face, clypeus 

 and thorax with a silvery pubescence densest and brightest on the first 

 mentioned parts. Length 9 mm. 



$ . — Space between eyes at top greater than the length of anten- 

 nal joints 2 and 3 united, but less than that of joints 3 and 4 united; 

 anterior margin of clypeus subtruncate, not emarginate or dentate; 

 upper surface of metathorax striated at the base; colored like the 9 ; 

 marginal cell obliquely truncated. Length 7 mm. 



Montana; Mt. Hood, Oregon. I am in some doubt whether what 

 I have described as the S , really belongs to this species; although 

 agreeing more closely with this, yet their locality would seem to indi- 

 cate relationship to tenuipunetus, to which species I had at first re- 

 ferred it. 



27. — Tachysphex consimilis n.sp. 



9 • — Anterior margin of clypeus subtruncate, not emarginate and 

 not dentate laterally; front finely granulated; vertex finely and 

 closely punctured; space between eyes at top greater than the length 

 of antennal joints 2 and 3 united, but a little less than the combined 



