530 PROCEEDINGS OF THE ACADEMY OF [1893. 



32. — Tachysphex nigrior n. sp. 



9 . — Anterior margin of clypens subtruncate, entire, not or 

 indistinctly dentate laterally; front very finely granulated; vertex 

 very finely and closely punctured; space between the eyes 

 at top greater than the length of antenal joints 2 and 3 

 united, but a little less than that of joints 3 and 4; autenme long 

 and slender, first joint of flagellum nearly one-third shorter than the 

 second; dorsulum with fine, tolerably close punctures, but neither 

 as fine nor as close as those on the vertex; scutellum not impressed; 

 metathorax above rather delicately reticulated, the metapleurse and 

 posterior face distinctly, but not strongly, striated ; legs, in compari- 

 son to triquetrus and crthiops, feebly spinose; pygidial area strongly 

 and sparsely punctured, its length about two- and-a-half times greater 

 than it is wide at base. Entirely black, except mandibles medially, 

 scape beneath at apex and last three joints of tarsi, which are red- 

 dish; wings subhyaline, iridescent, nervures blackish; mai-ginal cell 

 obliquely subtruncate; second submarginal cell at the top usually 

 somewhat wider than the second; face and clypeus with sparse, sil- 

 very pubescence; thorax nude; abdomen sparsely pilose. Length 7-9 

 mm. 



$ . — Anterior margin of "clypeus as in the 9; front likewise; 

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

 antennal joints 2, 3 and 4; antennae not very long, rather stout, the 

 flagellum thickened somewhat medially, with the first joint not 

 much shorter than the second; scutellum slightly impressed; meta- 

 thorax sculptured as in the 9 , but more strongly; colored like the 

 opposite sex. Length 6-8 mm. 



State of Washington. One specimen, a female, has the basal seg- 

 ments of abdomen obscurely reddish, which would indicate that there 

 may be examples with the abdomen red and black. 



33.— Tachysphex pauxillus n, sp. 



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

 distinct tooth laterally ; front very finely granulated; vertex very 

 finely and closely punctured; space between the eyes at top greater, 

 but not much, than the length of antennal joints 2 and 3 united, much 

 less than that of joints 3 and 4 united; antennre long and slender, the 

 first joint of flagellum nearly one-third shorter than the second; dor- 

 sulum with very fine, tolerably close punctures, the latter are as fine 



