524 PROCEEDINGS OF THE ACADEMY OF [1893. 



first two joints, obscure reddish; abdominal segments 1-3 bright red; 

 wings subhyaline, iridescent, nervures testaceous; marginal cell 

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

 top about equal; head in front and the thorax sparsely clothed 

 with silvery pubescence; abdomen without silvery pile. Length 

 11-12 mm. 



$ . — Front and vertex a little more strongly punctured than in 

 the 9 ; anterior margin of clypeus subtruncate, not dentate laterally; 

 space between eyes at top greater than the length of antennal joints 

 2 and 3 united, but less than the length of joints 3 and 4 united; an- 

 tennae long, setaceous ; first joint of flagellum about one-quarter shorter 

 than the second; dorsulum with very fine and close punctures; meta- 

 thorax above and on the sides finely coriaceous; legs tolerably well 

 armed with spines ; colored like the 9 , but the wings darker. 

 Length 9-11 mm. 

 Colorado. 



23. — Tachysphex decorus u. sp. 



9 . — Anterior margin of clypeus subtruncate, dentate laterally; 

 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 but little shorter than the 

 second; dorsulum very finely and closely punctured; scutellum not 

 impressed; upper surface of metathorax with tolerably strong longitudi- 

 nal, sinuous striations or folds, the metapleurre very indistinctly 

 striated, the posterior face more distinctly so ; legs rather strongly 

 spinose; pygidial area impuuctate, very narrow on apical portion, 

 its length about two-and-a-half times longer than it is wide at the 

 base. Black; mandibles medially, scape beneath at apex and tarsi, 

 except basally, reddish ; abdomen without silvery pile, the first three 

 segments bright red; wings subhyaline, iridescent, nervures testa- 

 ceous; marginal cell broadly and obliquely truncate; second submar- 

 ginal cell at the top greater than the third at the same place; face 

 and clypeus with sparse silvery pubescence ; thorax with a sparse sil- 

 very pile. Length 9 mm. 



Dakota. Based on a specimen labelled Larrada daJeota Cress., 

 which is evidently only a manuscript name. 



24. — Tachysphex inusitatus u. sp. 



$ . — Front finely and closely punctured, widely channelled down 



