236 KANSAS UNIVERSITY QUARTERLY. 



but reach the margin in nearly their full width; the black interval 

 between the stripes is about equal in width to the stripes. 

 One specimen, Magdalena mountains, N. M. (Aug.). 



Syrphus americanus Wied. 



More than two hundred specimens, Manitou Park, Colo. (July, 

 Aug.); Estes Park, Colo. (Aug., at high altitudes); New Mexico 

 (Gaumer); Magdalena mountains, N. M. (Aug., 7500 — 9500 ft.). 

 This large series of specimens shows considerable variation in some 

 respects, but I am not able to separate individuals exhibiting extremes 

 of variation on account of the intergradations. With a good simple 

 lense, sparse short pubscence is observable upon the eyes of all the 

 males, including those from more eastern localities (Kans., 111., Fla.). 

 This pubescence is more marked on individuals which were taken at 

 high altitudes. The spots above the antennas may be obsolete, 

 faintly brown, or large and deep black; in general they are fainter in 

 the specimens taken at high altitudes. The facial stripe shows every 

 degree of development and is frequently absent. The pile on the 

 sides of the face is black, or black and yellow mixed, or yellow except 

 near the antennae. In specimens from the lower altitudes this pile is 

 generally wholly black. The spots of the second abdominal segment 

 reach the lateral margin in many cases, sometimes broadly. 



Several of these variable character's are used by Osten Sacken to 

 distinguish abbreviatiis from aviericaniis, which differ chiefly in the 

 color of the cheeks, a character also mentioned by him. — A common 

 species all over the country. 



Syrplius opinator O. S. 



One male, Manitou Park, Colo.; ten males, Magdalena mountains, N. 

 M. (Aug.). A distinctly western species, very similar in appearance 

 to ainericaiiiis. The eyes are also very feebly pubescent. The wholly 

 yellow cheeks, narrow abdominal bands of the third and fourth seg- 

 ments which do not reach the margin, and the rather bright yellow 

 scutellum, will distinguish the species. 



Syrphus montivagus, 11. sp. 



Eyes bare; no facial stripe; cheeks black; oral margin very widely 

 black; scutellum scarcely lighter than the thorax; the reddish yellow 

 abdominal spots or bands do not reach the margin, those of the third 

 and fourth segments interrupted or connected; these bands are very 

 wide; femora black at the base. 



Male. Front and face brownish yellow; the former rather promi- 

 nent, black pilose and whitish pollinose except in the middle anter- 

 iorly; no dark spots above the antenna. Antennae dark brown, third 



