I 



Syrphidae of Nebraska 45 



Eristalis latifrons Loew. Cent., vi, 65 (1865); Williston, Synop. N. A. 

 Syrph., 164 (1886). 

 1877. stipator Osten Sacken, West. Dipt., 336. 



Fifty-eight $ $ and ninety-nine $ 9 taken at the following 

 localities: Monroe Canyon, Sioux County; Glen, Sioux 

 County; Mitchell, Scottsbluff County; Bridgeport, Morrill 

 County; Haigler, Dundy County; Hitchcock County; McCook, 

 Redwillow County; Curtis, Frontier County; Halsey, Thomas 

 County; Gordon, Sheridan County; Cams, Keyapaha County; 

 Concord, Dixon County; Maskell, Dixon County; Coburn, 

 Dakota County; West Point, Cuming County; Lincoln, Lan- 

 caster County; South Bend, Cass County; Louisville, Cass 

 County; Fairmont, Filmore County; Omaha, Douglas County, 

 and Rulo, Richardson County, between May and October. 



The description of a new Eristalis from Colorado is here 

 appended : 



Eristalis nitidus n. sp. 



9. Length 10-12.5 mm. Face shining black covered with a dense 

 white pollen except the tubercle and nearly all the front. Front wide 

 with white and black pile, the white pile being just above the base of the 

 antennae. Occiput with long pale hairs. Eyes dark pilose. Antennal 

 pits yellowish. First and second joints of antennae black, the third 

 brownish- black and nearly quadrate. 



Thorax bluish-black, little shining, densely covered with moderately 

 long pale yellowish pile. Pleura bluish-black, clothed in long whitish 

 pile. Scutellum with a reddish yellow cast and clothed with pale yel- 

 lowish pile. 



Abdomen shining bluish-black with the posterior margin of each seg- 

 ment, except the first, reddish yellow. First segment covered with white 

 pollen, clothed with white pile, the remaining segments with black pile 

 on the dorsum and white pile on the margins. 



Femora except the apices, basal half of all the tibiae, and the tarsus 

 except the first two joints of the middle and hind pairs, blackish, the 

 remaining portion of the legs yellowish. 



Wings hyaline except a brown spot at the base and another across the 

 center of the wing. 



S. Length 10-11 mm. Similar to the female. The second segment 

 of the abdomen has a triangular yellow spot on each side, the third 

 segment has an anterior and posterior uninterrupted opaque band, and 



151 



