574 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



Cope, Colorado. One female collected August 9, 1905, by S. A. 

 Johnson, for whom the species is named. 



Type. — Colorado Agricultural College. 



This species is close to T. mundus Fox, but may be distinguished 

 from that species by the broader, poorer defined, sparser punctured 

 pygidum; the absence of a transverse carina separating the dorsal 

 aspect of propodeum from the posterior face; the more shining and 

 finer sculptured front; the fewer punctures of the clypeus; and the 

 bright red color of the abdomen. 



TACHYSPHEX OPWANUS, new species. 



Male. — Length 7.5 mm. Anterior margin of the clypeus rounded 

 out, teeth small almost wanting; front finely granular; vertex with 

 fine punctures; occiput flat; furrow from the anterior ocellus dis- 

 tinct; space between the eyes at the vertex greater than the length of 

 antennal joints two and three, but not as great as the length of joints 

 three and four; third antennal joint distinctly longer than the 

 fourth; mesonotum and scutellum finely closely punctured; dorsal 

 aspect of propodeum finely granular; sides shining very finely 

 striated; posterior face not separated from the dorsal aspect by a 

 transverse carina, rather coarsely transversely striated, fovea distinct 

 sharply defined; emargination of the fore femora rounded; inner 

 calcarium of the hind tibise almost as long as the basitarsus; second 

 and third cubital cells of about equal width on the radius; abdomen 

 very finely punctured; last ventral plate rather narrow, arcuately 

 emarginate lobes narrow and short. Black; eyes (dry) green; tegulae 

 ferruginous; four apical joints of the tarsi two basal segments of the 

 abdomen, except the base of the first rufous; wings slightly yellowish 

 hyaline, venation pale brown; clypeus, femora beneath and bands on 

 the dorsal abdominal segments covered with silvery pile; front with 

 golden pile. 



Golden, Colorado. One male collected in July, by C. P. Gillette. 



Type. — Colorado Agricultural College. 



This species is something like T. exsertus Fox. It is also similar to 

 T. mundus Fox, but it may be known from both of these by the golden 

 pile of the front and other characters. 



The last three species described resemble each other in general 

 appearance, but may be separated as follows: 



Front with golden pubescence; posterior face cf the propodeum coarsely striated; 

 teeth of the clypeus small opwanus. 



Front without golden pubescence; posterior face of the propodeum not coarsely 

 striated; teeth of the clypeus larger 1. 



1. Anterior margin of the clypeus with two lateral teeth; apical third of the clypeus 

 smooth with large scattered punctures; inner calcarium of the hind tibiae as 



long as the basitarsus johnsoni. 



Anterior margin of the clypeus with one lateral tooth; entire clypeus closely punc- 

 tured; inner calcarium of the hind tibise shorter than the basitarus. arygrotrichus. 



