532 PROCEEDINGS <)E THE ACADEMY OF [1893. 



ernarginate medially and armed laterally with two teeth; front with 

 exceedingly fine and close punctures ; vertex with the punctures 

 more distinct; space between the eyes at top about equal to the length 

 of antennal joints 2 and 3; first joint of flagellum about one-quarter 

 shorter than the second; dorsulum somewhat more coarsely punc- 

 tured than the front; scutellum not impressed ; metathorax coria- 

 ceous or else finely granulated, the sides smooth, the posterior face 

 striated; tegs tolerably spinose; longer spur of hind tibiae in length 

 greater than the first joint of the hind tarsi ; pygidial area strongly 

 and sparsely punctured, in length but little greater than twice longer 

 than its width at the base. Black; mandibles medially and scape 

 beneath at apex, reddish ; tarsi, tegulse and the apical margins of 

 segments (more broadly than in the other species) testaceous; wings 

 pale subhyaline, iridescent, nervures testaceous ; marginal cell nar- 

 rowly truncate; head in front and the thorax with dense silvery 

 pubescence; abdomen with a dense silvery pile, which appears as 

 four bands when viewed from behind. Length 8-9 mm. 



$ . — Anterior margin of clypeus not emarginate or dentate ; front 

 rather coarsely granulated; vertex more distinctly punctured than in 

 the 9 ; space between the eyes at top greater than the length of an- 

 tennal joints 2 and 3 united, but scarcely equal to that of joints 3 

 and 4; first joint of flagellum nearly one-third shorter than the sec- 

 ond; dorsulum with the punctures separated; scutellum distinctly 

 impressed; metathorax above strongly granulated, the sides coria- 

 ceous ; colored like the ? , except that the abdomen is entirely testa- 

 ceous. Length 8 mm. 



Illinois; Texas. This species is as densely pilose as punctifrons, 



but the pile is silvery, the sculpture different and the size much 



smaller. 



36. — Tachysphex minimus Fox. 



Tachytes miniums Fox, Tr. Amer. Ent. Soc. XIX, p. 248. $ . 



$. — Anterior margin of the clypeus subtruncate, not dentate 

 laterally ; front with exceedingly fine and close punctures ; space be- 

 tween the eyes at top about equal to the length of antennal joints 2 

 and 3 united ; first joint of flagellum about one-quarter shorter than 

 the second; dorsulum with the punctures even and distinct, much 

 stronger than those of the front; scutellum not impressed ; meta- 

 thorax above granulated, the metapleune and posterior face finely, 

 though distinctly, striated. Black ; mandibles medially and scape 



