220 BULLETIN" 143, UNITED STATES NATIONAL MUSEUM 



IDubescence and the second tergite with obscure yellowish pubescence 

 on the yellow area; first segment nodose; the first tergite coarsely, 

 somewhat confluently punctate; the second tergite with large, dis- 

 tinct, contiguous punctures throughout; tergites 3-6 densely punc- 

 tate, the punctures becoming smaller on each successive tergite, those 

 on the sixth fine; pygidial area glabrous, indistinctly sculptured, 

 with an inconspicuous, thin, apical fringe of short, erect hairs; 

 carina of first sternite prominent, but not dentate, the sternite 

 coarsely, confluently punctured; second sternite with large, distinct, 

 contiguous punctures throughout, without a median pit filled with 

 hairs; sternites 3-6, with small, scattered punctures near the apical 

 margin; ultimate tergite punctate and pubescent. 



Legs black, clothed with long, sparse, black pubescence; calcaria 

 black. 



Wings dark fuliginous; cell 2nd R^ + Ro broadly truncate at the 

 apex; cell R^ almost obsolete; vein M3+4 received by cell R5 at one- 

 third the distance between the base and the apex; veins r-m and 

 R5 approximate on vein r. 



IIoJoti/pe.—Male, Halsey, Nebr., August 29, 1924 (R. W. Dawson) ; 

 in collection of University of Minnesota. 



Distrtljutwn. — Montana, Wyoming, South Dakota, Nebraska, Kan- 

 sas, Oklahoma, and Texas. 



Paratijpes. — Male, West Point, Nebr., June 21 (P. R. Jones) ; 

 male. West Point, Nebr., June 22, 1905 (H. S. Smith) ; male, Ogal- 

 lala, Nebr., June 24, 1913 (R. W. Dawson) ; male, Bridgeport, Nebr., 

 July 11, 1917 (C. E. Mickel) ; 5 males, 40 miles north of Lusk, Wyo., 

 July, 1895; male, Billings, Mont., July 18, 1904; 2 males, Riley 

 Count}^, Kans., June 26 (G. A. Dean) ; male, Riley County, August 

 7 (Popenoe) ; male, Nickerson, July 5, 1914; male, Belvidere, June 

 (W. Knaus) ; 4 males, Clark County, June (F. H. Snow) ; male 

 Finney County, June, 1895 (H. W. Menke) ; male, Morton County 

 (F. H. Snow)'; male, Hamilton County, June, 1902 (F. H. Snow) ; 

 male, Payne County, Okla., June 3, 1925 (W. J. Brown) ; male. Hot 

 Springs, S. Dak., July 8, 1924; female, Richmond, Tex., June 22, 

 1917 : male. Lee County, Tex., August 3, 1905 ; in collections of Uni- 

 versity of Minnesota, University of Nebraska, University of Kansas, 

 Kansas State Agricultural College, Montana State Agricultural Col- 

 lege, Cornell L^niversity, South Dakota State Agricultural College, 

 W. Knaus, and the author. 



This species is similar to canclla but differs from the latter by 

 the absence of the median pit on the second abdominal sternite and 

 by the less coarse sculpture of the propodeum. It resembles arcana 

 but may be distinguished from that species by the second abdominal 

 segment not being entirely ferruginous and the denser punctura- 

 tion of the second tergite. The paratypes vary in length from 

 6-9 mm. 



