348 Annals Entomological Society of America [Vol. X, 



16. Punctations of the first and second segments of the gaster dense; segments 



of the gaster largely black coloradensis Cresson 



Punctations of the gaster sparse; gaster largely yellow, .xanlhogaster Isely 



17. Petiole pyriform, widest at apical margin, more heavily punctate than the 



second segment of the gaster; markings yellowish- white; no dots on 



either side of the petiole fraternus Say 



Petiole campanulate, widest before apical constriction, as heavily punc- 

 tate as the second segment; markings of bright yellow; a dot on either 

 side of the petiole verticalis Say 



18. Sides of the prothorax before the tegulae concave; second segment of 



the gaster with a broad depression before the apex extending to the 

 sides, dorsal line strongly recurved apically, dorsal angle obtuse. 



crassicornis Isely 

 Sides of the prothorax contracted before the tegulee, but convergent 

 immediately before the anterior margin of the prothorax; depression 

 on the second segment of the gaster not extending to the sides, dorsal 

 line slightly recurved apically, dorsal angle near a right angle. 



pachygaster Isely 



Smithii Group. 



The smithii group contains brownish and yellowish species 

 but none that are predominantly black. It differs from the 

 others of the genus by the depth of the furrow of the propodeum, 

 and on the ventral aspect of the petiole by the absence of 

 carinas along the margins of the tergite and the absence or reduc- 

 tion of punctations attaining these margins. Smithii, belfragei 

 and hollii resemble each other in general appearance, and in 

 particular by the shape of the clypeus and by the shape of the 

 second segment of the gaster. 



Eumenes brunneus new species. 

 Male. — Length, 12.5 mm. ; wing, 9.5 mm. Clypeus long and narrow, 

 lateral lines diverging but little apically, apical notch narrow, angular, 

 surface slightly convex, not flattened apically, without brown chitinized 

 median spot above the apex, very finely punctate; head flattened 

 dorsally, densely punctate; thorax stout, nearly as broad as long, 

 slightly rounded in front, strongly convex dorsally and laterally; sides 

 of prothorax immediately before anterior margin, concave; propodeum 

 separated with a deep median furrow; petiole elongate — three times as 

 long as wide at the apex, pyriforni, never abruptly inflated, punctations 

 of medium depth, on ventral aspect of tergite sparse and not extending 

 up to the margin; second segment of the gaster a third longer than wide, 

 lateral lines divergent until nearly half-way from base then nearly 

 parallel, transverse depression before median apical margin very slight, 

 finely punctate, more densely apically than basally. General color 

 f crrtiginous ; ferrugino-tcstaccous on the antennae and third to last 

 segments of the gaster, ferruginous on the thorax and somewhat 

 duller on the second segment of the gaster; wings subhy aline, 

 yellowish-brown; clypeus, mandibles, anterior surface of the scape, 

 emargination of the eyes, a post-ccular line, a wide bard on the anterior 



