Syrphidae of Nebraska 31 



This is an abundant species in the state. There are in the 

 University collection eighteen $ s and twenty-one $ $ from 

 the following localities: Omaha, Douglas County; Child's 

 Point, Sarpy County ; Bellevue, Sarpy County ; Meadow, Sarpy 

 County; Roca, Lancaster County; Lincoln, Lancaster County; 

 Beatrice, Gage County ; Gordon, Sheridan County ; Bridgeport, 

 Morrill County; Glen, Sioux County; Harrison, Sioux County; 

 Monroe Canyon, Sioux County, and Bad Lands, Sioux County, 

 between April 10th and September 2nd. 



Syrphus opinator Osten Sacken. West. Dipt., 327 (1877); Williston, 

 Synop. N. A. Syrph., 83 (1886) ; Snow, Kans. Univ. Quart., iii, 236 

 (1895). 



Two S $ and four $ 5 taken at Monroe Canyon, Sioux 

 County; Glen, Sioux County, and Omaha, Douglas County, be- 

 tween August 7th and 20th. 



Syrphus snowi Curran. ( ^ ruflcauda Snow) . 



1892. ruficauda Snow, Kans. Univ. Quart., i, 36. 



A 5 from Monroe Canyon, Sioux County, August 16, 1912 

 (E.J.Taylor). 



MiCRODONTINAE 



Microdon Meigen 



KEY TO THE SPECIES 



1. Slender, elongate species; antennae short, third joint a little 

 longer than the first two together, wings indistinctly fasci- 



ate coarctatiis 



Short, thick-set species 2 



2. Scutellum not emarginate; large black species; first joint a trifle 

 longer than the second and third together, third joint when 

 viewed from the side lanceolate lanceolatus 



Scutellum emarginate 3 



3. Hind metatarsi extraordinarily thickened and dilated fuscipennis 



137 



