40 Everett E. Wehr 



Wings with cloudiness other than on cross- veins; smaller spe- 

 cies; in front of scutellum two yellowish oval spots; abdomen 

 with three rather broad yellow bands fasciata 



Volucella satur Osten Sacken. West. Dipt., 333 (1877); Williston, 

 Synop. N. A. Syrph., 142 (1886). 



Two S S and five 9 9 collected in the western part of the 

 state at Glen, Sioux County; Monroe Canyon, Sioux County, 

 and Bad Lands, Sioux County, in August (12-19). 



Volucella fasciata Macquart. Dipt. Exot., ii, 2, 22 (1842); Osten Sac- 

 ken, West. Dipt., 334 (1877); Williston, Synop. N. A. Syrph., 145 

 (1886). 



Eight s s and ten 9 9 collected from the following locali- 

 ties: Warbonnet Canyon, Sioux County; Monroe Canyon, 

 Sioux County; Glen, Sioux County; Imperial, Chase County; 

 Haigler, Dundy County; Hitchcock County; Curtis, Frontier 

 County; Gordon, Sheridan County; Mouth of Gordon Creek, 

 Sheridan County ; Halsey, Thomas County ; Springview, Keya- 

 paha County, and Lincoln, Lancaster County, between April 

 18th and September 30th, 



Copestylum Macquart 



Copestylum marginatum (Say). Jr. Acad. Nat. Sci. Phil., vi, 167 (1829) ; 

 Williston, Synop. N. A. Syrph., 151 (1886). 



Three s S and two 9 9 taken at Crawford, Dawes 

 County ; Haigler, Dundy County, and Halsey, Thomas County, 

 between May 25th and August 12th. 



Eristalinae 



key to the genera 

 1. Marginal cell closed Eristalis 



Marginal cell open 2 



2. No stigmatical cross-vein ; epaulet at base of costa broad and 

 clothed with mostly yellowish hairs; squamae broad, bordered 



146 



