424 NEW SPECIES OF HYMENOPTERA 



paratype collected at Warbonnet Canyon, Sioux County, Ne- 

 braska, May 27, 1901, (M. A. Carriker, Jr.); one female paratype 

 without data. 



Closely related to vernalis, but quite distinct and may be dis- 

 tinguished as follows: the distance between the posterior ocelli 

 is about equal to the distance between them and the nearest 

 eye margins, in both sexes. In the female the mesoscutellum is 

 black and punctured, and the markings on the pronotum differ 

 from that of vernalis. In the male the abdominal markings 

 differ, the venter is entirely black, and the tibial shield is quite 

 differently shaped and colored from that in vernalis. The 

 species is named for Prof. Lawrence Bruner who collected most 

 of the specimens. 



Thyreopus (subgenus?) knoxensis sp. nov. 



cj^. Length 7.5 mm. Anterior margin of clypeus truncate; impressed line 

 of front deep; front appearing striato-punctate, remainder of head moderately 

 punctate; space between the two posterior ocelli about equal to the space 

 between one of them and the nearest eye margin; the two posterior ocelli 

 behind a line drawn across the vertex at the posterior margin of the eyes; first 

 joint of flagellum slightly longer than the second; flagellum with short, sparse, 

 curled hair beneath; pronotum strongly toothed laterally; mesoscutum and 

 mesoscutellum with distinct, well-separated punctures, episterna with some- 

 what sparse, fine punctures; propodeum above strongly channelled medially, 

 with two distinct enclosed spaces which are more or less rugose within; the 

 medial channel continues on the posterior face, narrowing and terminating 

 on the apical half; lateral ridges of posterior face distinct; the sides and pos- 

 terior face of the propodeum finely, transversely rugose; abdomen dorsally, 

 microscopically punctate; fore femora not spined; intermediate tibiae without 

 a spur; first joint of hind tarsi distinctly longer than the longer spur of the 

 hind tibiae. Black; two small lateral spots at the base of the clypeus, scape 

 slightly at the tip and behind, posterior lobes of pronotum, lateral spots on 

 tergites one to four (those on segment four quite narrow), minute, lateral 

 spots on second sternite, anterior femora in front, intermediate femora at the 

 tip, anterior tibiae, intermediate tibiae (except a line within), posterior tibiae 

 at the base and first joint of anterior and intermediate tarsi, yellowish (in the 

 type the color is reddish from being over-cyanided) ; tegulae, stigma and ner- 

 vures of wings brownish. Clypeus and inner orbits silvery pubescent. 



9 . Unknown. 



Type, a male collected at Knox, North Dakota, July 13, 1911, 

 on Sium cicutaefolium, (O. A. Stevens). 



Related to oywana Rohwer, by the absence of the spiu's on 

 the intermediate tibiae, but is quite distinct from that species. 



