26 Everett E. Wehr 



Xanthogramma Schiner 

 KEY TO THE SPECIES 



1. Scutellum with basal half black flavipes 



Scutellum yellow 2 



2. The yellow band on the second abdominal segment does not at- 

 tain the lateral margin felix 



The yellow band on the second abdominal segment attains the 

 lateral mai'gin 3 



3. Second and third abdominal segments with the extreme anterior 

 angles yellow emarginata 



Second and third abdominal segments with the extreme anterior 

 angles not yellow aenea 



Xanthogramma flavipes (Loew). Cent., iv, 83 (1863); Williston, 

 Synop. N. A. Syrph., 94 (1886). 



Two s S taken at Omaha, Douglas County, on July 17 and 

 August 3, 1913, and one 9 taken on August 17, 1914, by L. T. 

 Williams, 



Xanthogramma felix Osten Sacken. Bull. Buff. Soc. Nat. Sci., iii, 

 67 (1875); Williston, Proc. Amer. Phil. Soc, xx, 311, (1882). 



A s taken at Lincoln, Lancaster County, July 9, 1909 (C. 

 H. Gable). 



Xanthogramma emarginata (Say). Jr. Acad. Nat. Sci. Phil., iii, 91 

 (1823); Williston, Synop. N. A. Syrph., 93 (1886). 



Three S $ and two 9 9 collected at the following locali- 

 ties: Omaha, Douglas County; West Point, Cuming County, 

 and Neligh, Antelope County, between June 18th and August 

 30th. 



Xanthogramma aenea Jones. Jr. N. Y. Ent. Soc, xv, 93 (1907). 



The type was a 9 from West Point, Cuming County, Ne- 

 braska, taken in June, 1906, by P. R. Jones. A 6 collected 



132 



