CLARENCE E. MICKEL 417 



Type, a male collected at Sowbelly Canyon, Sioux County, 

 Nebraska, June 23, 1911, (R. W. Dawson). Four paratypes 

 collected at the same place on the same date. 



Allied to nigrocaudatus. The triangular clyjical projection, 

 sculpture of the propodeum and puniui'cd epistcnia will serve 

 to distinguish it from that species. 



Tachytes austerus sp. iiov. 



9 • Length 8 to 9 mm. Modprateh' slender. Anterior margin of elypeus 

 narrowly and deeply emarginate medially, with three obtuse, lateral teeth; 

 second joint of antennae about three-fourths the length of the third, whicli is 

 equal in length to the fourth; interocular space at the vertex about equal to 

 the combined length of antennal joints three and four; front with moderately 

 close punctures; the space between the punctures finely reticulate; vertex 

 with intermingled punctures of varying size; mesoscutum and episterna punc- 

 tured like the front; mesoscutellum shining, sparsely punctate; disc of propo- 

 deum very closely punctate, appearing granulate, shining and impunctate on 

 the posterior margin; sides of propodeum finely and rather closety punctate; 

 posterior face closely and deeply punctate, the punctures almost touching, 

 channelled medially; longer spur of hind tibiae about equal in length to the 

 basitarsus; wings subhyaline; marginal cell narrowly and obliquelv truncate; 

 second submarginal cell about a third wider on the radial vein than the third 

 submarginal; abdomen clorsally finely and sparsely punctured; ventrally the 

 punctures are larger and more variable in size. Black; first and l)asal half of 

 the second abdominal segments reddish; leg spines pale; body clothed with 

 sparse silvery pile; bristles of pygidium bronzed. 



cf. Unknown. 



Type, a female taken at Omaha, Nc^braska, August 5, 1914, 

 (L. T. Williams). 



Related to abdorninalis , but differs from that species by having 

 the anterior margin of the elypeus strongly emarginate, in the 

 different puncturation, smaller size, and the recurrent veins not 

 proximate on the cubitus. 



Tachytes maestus sp. nov. 



? . Length 6 to 7.5 mm. Slender, .\nterior margin of elypeus slightly 

 emarginate medially, with three lateral teeth; second antennal joint al)Out 

 three-fourths the length of the third, which is subequal in length to the fourth; 

 interocular space at the vertex about equal to the combined length of anteinuil 

 joints three and four; front with rather s|)arse, shallow punctures; \ertex more 

 closely and finely punctured; mesoscutum, episterna and mesoscutellum with 

 rather sparse, deep punctures; disc of propodeum granulate, with a shallow 

 fovea medially on the posterior margin; sides of propodeum punctate; pos- 

 terior face quite closely punctate; longer spur of hind tibiae shorter than the 

 basitarsus; wings subhyaline; marginal cell obliquely truncate at the apex; 



TRANS. AM. ENT. SOC, XLII. 



