24 Everett E. Wehr 



Mesogramma Loew 

 KEY TO THE SPECIES 



1. Scutellum yellow, legs yellow, except the hind tarsi 2 



Scutellum black or brown with a yellow border; front of female 



above only a little narrowed; hind femora wholly yellow 



marginata var. 



2. Front of female only a little narrowed above; third to fifth ab- 

 dominal segments with narrow lateral yellow margins marginata 



Front of female much narrowed above; third to fifth abdominal 

 segments with no yellow on the margins polita 



Mesogramma marginata (Say). Jr. Acad. Nat. Sci. Phil., ii, 92 

 (1823). 

 1886. Mesograpta marginata Williston, Synop. N. A. Syrph., 

 100. 



The University collection contains a large series of this 

 species, fifty-four s $ and sixty-one $ $ , from the following 

 localities: Rulo, Richardson County; Omaha, Douglas County; 

 Lincoln, Lancaster County ; Beatrice, Gage County ; Fairmont, 

 Fillmore County; York, York County; South Bend, Cass 

 County; West Point, Cuming County; Coburn, Dakota County; 

 Concord, Dixon County; Maskell, Dixon County; South Sioux 

 City, Dakota County; Neligh, Antelope County; Butte, Boyd 

 County; Cams, Keyapaha County; Glen, Sioux County; Mon- 

 roe Canyon, Sioux County, and Mitchell, Scottbluff County, 

 between May 9th and September 13th. 



Mesogramma polita (Say). Jr. Acad. Nat; Sci. Phil., iii, 68 (1823); 

 Snow. 



1886, Mesograpta polita Williston, Synop. N. A. Syrph., 98. 

 Kans. Univ. Quart., iii, 239 (1895). 



Three s s and one $ taken at Lincoln, Lancaster County, 

 in the month of September. 



Allograpta Osten Sacken 



AUograpta obliqua (Say). Jr. Acad. Nat. Sci. Phil., iii, 89 (1823); 

 Williston, Synop. N. A. Syrph., 96 (1886). 



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