422 NEW SPECIES OF HYMENOPTERA 



head and thorax finer and sparser; and the impressed Unes form- 

 ing the enclosure of the propodeum indistinct. 



Thyreopus (Subgenus?) stygius sp. nov. 



9 . Length 7.5 mm. Ch'peus very feebly carinated; the anterior margin 

 with the produced portion squarely truncate; frontal depression shallow, gla- 

 brous, distinct; impressed hne running to the fore ocellus deep; ocelli in an 

 equilateral triangle, the space between the posterior pair slightly less than the 

 space between one of them and the nearest eye-margin; front, vertex,, occiput 

 and cheeks sparsely, microscopically punctate; first joint of flagellum very 

 slightly longer than the second; pronotum transversely impressed before the 

 apical margin, very slightly, longitudinally impressed medially; mesoscutum 

 with distinct, well-separated punctures, more strongly and closely punctured 

 than the head; mesoscutellum apparently impunctate; episterna punctured 

 like the mesoscutum; episterna with a short carina originating at the coxal 

 cavity and terminating in a short, sharp tubercle; enclosed space of propodeum 

 distinct, the impressed lines forming it strongly foveolate; medial furrow run- 

 ning the entire length of the propodeum, the portion in the enclosed space 

 strongly foveolate; enclosed space with several, short, distinct striae at the 

 base; sides of the propodeum, finely, obUquely rugose; lateral ridges of pos- 

 terior face distinct, foveolate outwardly; posterior face evidently transversely 

 rugose; abdomen microscopically punctate, more so on the apical segments; 

 pygidivmi narrowed at the apex, excavated; tibiae spinose; wings hyaline; first 

 transverse cubitus received by the marginal cell distinctly before the middle. 

 Black; tegulae brownish; apical abdominal segment somewhat rufous; apices 

 of tibiae, intermediate and posterior tarsi somewhat reddish; tibial spurs 

 testaceous 



cf. Unknown. 



Type, a female collected in the Bad Lands at the Mouth of 

 Monroe Canyon, Sioux County, Nebraska, May 28, 1901, on 

 Astragalus sp., (L. Bruner). 



In Fox's table this species runs out at nigrior, but is distinct 

 from that species in the feebly carinate and truncate clypeus, 

 the different sculpture of the propodeum and the larger size. 



Thyreopus (Synothyreopus) bruneri sp. nov. 



1908. Crabro vemalis H. S. Smith. Univ. N(>l)r. Studies, viii, p. 400, (nee 

 Packard) . 



9 . Length 7 to 9 mm. Head finely granulate with sparse, shallow punc- 

 tures; distance between the two posterior ocelli about equal to the distance 

 between one of them and the nearest eye margin; impressed line running from 

 front to anterior ocellus moderately deep; a rather indistinct impressed line 

 running backward from the anterior ocellus; flagellum (exclusive of the pedi- 

 ccllum) more than twice the length of the scape; first joint of flagellum about 

 equal in length to the two following joints united; pronotum not furrowed at 

 the sides, slightly impressed medially, the lateral teeth small an^ blunt; meso- 



