48 Everett E. Wehr 



Helophilus laetus Loew. Cent., iv, 77 (1863); Williston, Synop. N. A. 

 Syrph., 189 (1886); Hunter, Canad. Ent., xxix, 139 (1897). 

 1895. aureopilis Townsend, Trans. Amer. Ent. Soc, xxii, 51. 



Five $ $ and one $ from Omaha, Douglas County; Lin- 

 coln, Lancaster County; Sandhills, and Mitchell, Scottsbluff 

 County, June 13th to September 10th, 



Polydontomyia Williston 



Polydontomyia curvipes (Wiedemann). Auss. Zweifl. Ins., ii, 149 



(1828). 

 1886. Triodonta curvipes Williston, Synop. N. A. Syrph., 206. 

 1877. Polydontia curvipes Osten Sacken, West. Dipt., 338. 



Three s S and six 9 9 taken at Lincoln, Lancaster 

 County; Haigler, Dundy County, and Mitchell, Scottsbluff 

 County between June 23rd and August 24th. 



Mallota Meigen 

 KEY TO THE SPECIES 



1. Eyes pilose; more or less of the base of the abdomen with 

 yellow pile posticata 



Eyes bare.... 2 



2. Eyes contiguous in the male; abdomen almost wholly black 

 pilose; hind tibiae of the male with a stout spur in the middle 

 (form bautias) or wholly without such spur cimbiciformis 



Eyes separated in the male 3 



3. Larger species; black facial stripe broad; abdomen black with 

 yellow hair on the base and apex; legs mostly blackish in 

 color fascialis 



Smaller species; black facial stripe narrow; abdomen black 

 clothed with light colored pile; legs mostly reddish illinoisensis 



Mallota posticata (Fabricius). Syst. Antl., 237 (1805); Williston, 

 Synop. N. A. Syrph., 201 (1886). 



Three s 6 and three $ 9 taken at Rulo, Richardson 



154 



