30 Evere.tt E. Wehr 



Syrphus americanus Wiedemann. Auss. Zweifl. Ins., ii, 129 (1830) ; 

 Osten Sacken, Proc. Bost. Soc. Nat. Hist., xvii, 145 (1875); Will- 

 iston, Synop, N. A. Syrph., 82 (1886). 



This species has quite a wide distribution over the state. 

 Fourteen S $ and twenty-six $ 5 have been taken at Falls 

 City, Richardson County; Omaha, Douglas County; Bellevue, 

 Sarpy County; South Bend, Cass County; Lincoln, Lancaster 

 County; South Sioux City, Dakota County; West Point, Cum- 

 ing County; Neligh, Antelope County, and Monroe Canyon, 

 Sioux County, between April 18th and August 30th, 



Syrphus arcuatus (Fallen) Dipt Suec. Syrph., 42, 11 (1816) ; Osten 

 Sacken, Proc. Bost. Soc. Nat. Hist., xviii, 149 (1875). 

 1877. lapponicus Osten Sacken, West Dipt., 326. 



Four s S and four 9 5 collected from Monroe Canyon, 

 Sioux County; Glen, Sioux County; Crawford, Dawes County, 

 and Mitchell, Scottsbluff County, between June 10th and 

 August 20th. 



Syrphus mentalis Williston. Synop. N. A. Syrph., 72 (1886); Hunter, 

 Canad. Ent., xxix, 130 (1897). 



One s taken at Glen, Sioux County, on August 10, 1905. 



Syrphus creper Snow. Kans. Univ. Quart., iii, 234 (1895). 



One $ taken in May in Sioux County. The second and 

 third abdominal crossbands are narrowly interrupted in this 

 specimen, but in three S 6 from Colorado (Estes Park, 

 Russell, Ute Creek) they are entire. 



Syrphus torvus Osten Sacken. Proc. Bost. Soc. Nat. Hist., xviii, 139 

 (1875); Williston, Synop. N. A. Syrph., 79 (1886). 



One 5 taken at Monroe Canyon, Sioux County, August 16, 

 1912 (E. J. Taylor). 



Syrphus ribesii (Linnaeus). Syst. Nat., 10th ed., 593 (1758); Willis- 

 ton, Synop. N. A. Syrph., 77 (1886). 



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