1893.] NATURAL SCIENCES OF PHILADELPHIA. 525 



the middle, on each side of which it is protuberant; anterior margin 

 of the clypeus subtruncate, not dentate laterally; occiput is remark- 

 ably depressed, which causes the cheeks to bulge somewhat at the top; 

 space between eyes at the top about equal to the length of antenna! 

 joints 3 and 4 united; antennae tolerably long, strongly setaceous, 

 the first joint of the flagellum scarcely one-quarter shorter than the 

 second; dorsulum with fine and close punctures; scutellum, slightly 

 impressed; metathorax above finely coriaceous, the metapleurse in- 

 distinctly striated, the posterior face more distinctly striated. Black; 

 mandibles medially, scape beneath at apex and tarsi more or less, 

 reddish: abdomen without silvery pile, the first three segments bright 

 red; wings dark subhyaline, iridescent, nervures testaceous; mar- 

 ginal cell obliquely subtruncate; width of second and third submar- 

 ginal cells at the top about equal ; front, face and clypeus with a 

 tolerably dense, silvery pubescence. Length 9 i mm. 



Colorado. The peculiar form of the head will at once distinguish 

 this species. 



25. — Tachysphex tenuipunctus n. sp. 



9 . — Anterior margin of the clypeus subtruncate, dentate lateral- 

 ly; front finely granulated; vertex finely and closely punctured; 

 space between the eyes at top about equal to the length of antennal 

 joints 2 and 3 united; first joint of the flagellum scarcely one-quar- 

 ter shorter than the second; dorsulum very finely and closely punc- 

 tured; scutellum slightly though distinctly impressed; metathorax 

 above granulated, the metapleurce finely coriaceous, the posterior face 

 faintly striated; pygidial area with tolerably strong, sparse punc- 

 tures, not narrowed more than usual apically, and is about two- 

 and-a-half times longer than it is wide at the base. Black; mandi- 

 bles medially, scape beneath at apex and the tarsi more or less (the 

 latter palest), reddish; abdomen without silvery pile, the first three 

 segments, sometimes only half of the third, bright red; wings sub- 

 hyaline, iridescent, nervures testaceous; marginal cell obliquely 

 subtruncate; width of the second and third submarginal cells at the 

 top about equal, if otherwise the second is usually widest; front, 

 face and clypeus with sparse silvery pubescence; thorax nude. 

 Length 9-11 mm. 



Mt. Hood, Oregon ; Brit, Columbia; Montana; Custer, South 

 Dakota (Aldrlch) ; Canada (?). Greatly resembles decortis, but 



