284 AMERICAN DIPTERA. 



Krax sp. 



One female from Glen, Sioux Co., Nebraska, which appears to be 

 near E. cinerascens, but is smaller, the pollen slightly more yellow- 

 ish, the second submarginal cell is slightly shorter, and the tibise 

 and tarsi dark red, and the apex of the tibiae nearly black. 



28. WAL,L,OPHOKA Macquait. 

 9IaIlo|>hora guildiana Willistou. 



Specimens from Gering, Sioux Co., and Gordon, Sheridan Co., 



Nebraska, which agree with the description, except that in all the 



specimens the first posterior cell is closed and petiolate. There is 



some variation in the color of the pile, being nearly yellow in those 



collected on Solidago, and nearly white on those collected on Cleome. 



29. PROW A €H US Loew. 

 Proniachus bastardii Macquait. 



Two males from McCook, one from West Point, and a female 

 from Glen, Sioux Co., Nebraska, which agree with the description 

 given by Willistou, except that the lateral black bristles on the 

 second abdominal segmeut are absent, and those on the lateral mar- 

 gins of the first segmeut are white. This is the first record of this 

 species being taken in the Western States. 



Promachus fitcliii Osteu Sacken. 



Two females from War Bonnet Canon, Sioux Co., Nebraska, 

 which agree with Williston's description, except that they are about 

 39 mm. in length. 



Promachiis vertebratiis Say. 



Specimens from Lincoln, Union, Weeping Water, Malcom and 

 West Point, Nebraska. 



30. STENOPROSOPUS Macquait. 

 Slenoprosopus ? u. sp. 



Length 9 mm. Face aud front narrow, face wider below, vertical in profile, 

 mystax composed of a few yellowish-white bristles on the lower part of the face. 

 Pollen over the entire body light brownish-yellow, lighter on the head. Antennse 

 black, second joint about two-thirds as long as the first joint, third shaped some- 

 what as in Tolmerm nofatus Wied., about as long as the first two joints together, 

 style short, about as long as the second joint, not one-half as long as the third 

 joint. Thorax (badly rubbed), marked as in Tolmerns notatus. Scntellum with 

 a distinct groove before the apex, and two bristles on the posterior margin. Hal- 

 teres light yellow. Abdomen black in ground color, covered with dense yellow- 

 ish gray pollen, posterior margins of the segments obscurely reddish-yellow. 

 Ovipositor small, shining black, yellow on the venter, compressed, a tuft of hair 

 at the tip. Legs black, tibiae yellow at the base, and tarsi obscurely reddish at 

 base. Pile and bristles on whole body light colored. Wings hyaline, grayish at 

 the apex. 



