286 AMERICAN DIPTERA. 



style long, longer than the first joint, about as long as the second 

 and third joints together. Thorax with pollen similar to that on T. 

 notatus, and marked similarly, more gibbose. Scutellum covered 

 with brownish-yellow pollen and white pile, on the posterior margin 

 with a row of weak bristles. Halteres brownish-yellow, stem lighter. 

 Abdomen covered with brownish-gray pollen, each segment with a 

 large median, nearly quadrate, subfulgent brown spot occupying 

 nearly all the segment, but not touching the lateral or posterior 

 margins. Ovipositor long, compressed, slightly more than the length 

 of the last four segments. Legs black, more robust than in T. 

 notatus, all the tibiae except the apex reddish. Wings shorter than 

 T. notatus, hyaline, tinged with brownish, stump of anterior branch 

 of the third vein extending inwardly as in the species of Erax, pos- 

 terior branch of third vein somewhat curved forward but not reach- 

 ing the tip of the wing, first posterior cell wider at the distal end 

 than is the second submarginal cell. 



I shall not name this species because of a lack of sufficient material. 



31. AS1L.IJS Liiine. 

 Asilns aniiiilatus Williston. 



Specimens from West Point, Meadow, Glen and Harrison, Sioux 

 Co., Nebraska, which agree quite well with the description, but the 

 occipito orbital bristles as well as the bristles on the legs are white 

 in some of the specimens. 



Asilus noTse scotiac Macquart. 



Specimens from Lincoln and Glen, Sioux Co., Nebraska, August 

 and September, which seem to answer to the description, except that 

 the front and thorax are ochraceous pollinose, and the bristles on 

 the dorsum and on the legs are both black and white, and the long 

 bristles on the front tibiae and tarsi are light colored. The occipito- 

 orbital bristles on some specimens are light yellow, on others mixed 

 black and yellow, and on still others nearly all are black. 



Asiius flavipes Williston. 



One female from War Bonnet Canon, Sioux Co., Nebraska, which 

 agrees with the description of the male. Formerly recorded fi'om 

 Connecticut and Pennsylvania. 



33. RAHDIURGUS Loew. 



Rliadiiirgus leucupogon Willistuu. 



Numerous specimens from Glen, Harrison and War Bonnet 

 Canon, Sioux Co., and Gordon, Sheridan Co., Nebraska. 



