38 Everett E. Wehr 



Abdomen opaque black except the anterior angles of the second seg- 

 ment, a triangular spot on each side of the third segment, the fourth 

 segment and the hypopygium which are metallic. Legs black with the 

 apices of the femora and bases of the tibiae reddish. 



Type. Ute Creek, Costella County, Colorado, 9,000 feet, 

 July 6, 1907 (L. Bruner). i. University of Nebraska col- 

 lection. 



Paratypes. Ute Creek, Costilla County, Colorado, 9,000 

 feet, July 6, 1907 (L. Bruner). 6 S S. University of Ne- 

 braska collection. 



Chalcomyia Williston 



Chalcomyia aerea (Loew). Cent., x, 53 (1872); Williston, Synop. 

 N. A. Syrph., 126 (1886). 



A ? collected at Cedar Bluffs, Saunders County, in April. 



Myiolepta Newman 



KEY TO THE SPECIES 



1. Abdomen black nigra 



Abdomen with luteous or yellow spots at the base varipes 



Myiolepta nigra Loew. Cent., X, 54 (1872); Williston, Synop. N. A. 

 Syrph., 129 (1886). 



A $ from South Sioux City, Dakota County, July 22, 1912 

 (L. T. Williams). 



Myiolepta varipes Loew. Cent., ix, 79 (1869); Williston, Proc. Amer. 

 Phil. Soc, XX, 308 (1882); Synop. N. A. Syrph., 128 (1886). 



Two S $ from Lincoln, Lancaster County, and Fairmont, 

 Fillmore County, on May 8, 1906 (L. Bruner) and June 16, 

 1915 (C. E. Mickel), respectively. 



Rhingia Scopoli 



Rhingia nasica Say. Jr. Acad. Nat. Sci. Phil., iii, 94 (1823); Will- 

 iston, Synop. N. A. Syrph., 130 (1886). 



144 



