34 KANSAS UNIVERSITY QUARTERLY. 



the antennae concave in profile ; an obtuse tubercle below the middle; 

 on the sides thickly covered witli pile. Proboscis rather prominent, 

 with broad labella. Eyes hairy, holoptic in the male. Abdomen 

 elliptical, as long or longer than the thorax. Legs moderately strong. 

 Third longitudinal vein straight, first posterior cell distally short 

 petiolate ; marginal cell open ; cross-vein situated near the middle 

 of the discal cell, oblique. 



Oallicera montensis, n. sp., Plate vii, f. 4. 



Male. Black, densely golden red pilose. Frontal triangle, face 

 and cheeks deep black, shining, covered thickly with black pile, save a 

 median facial stripe. Antennae black, basal third of third joint on 

 the under side red; first joint short; second joint not more than half 

 as long as the first; third joint three times as long as the first and 

 second joints taken together; gradually broadened for a third of its 

 length, and then attenuated; style white. Eyes thickly clothed with 

 golden pile. Thorax and abdomen covered everywhere with long 

 golden red pile. Legs black ; tarsal joints below and at their articu- 

 lations reddish. Wings nearly hyaline, brownish on the anterior basal 

 portion ; stigma yellow. 



Length ii millimeters. Three specimens, Colorado. 



The genus may be distinguished from Felecocera, in Williston's 

 dichotomic table of the genera of North American Syrphidae, by the 

 pilose eyes. 



Microdon meg'alog'aster, n. sp., Plate vii, f. 1. 



Male. Large, yellowish pilose species, in shape globose. Anten- 

 nae reddish black, the first joint about as long as the following two 

 together; second jf)int not one-third as long as the third. Face dark 

 metallic green, shining, thickly covered with golden yellow pile. 

 Front black, with similar pile, narrowed in the middle. Eyes bare. 

 Thorax and scutellum deep metallic green, with long, thick, golden 

 pile ; scutellum gently emarginate, the small obtuse tubercles ap- 

 proximate. Abdomen short and broad, black, moderately shining; 

 first two segments and the hypopygium somewhat green ; pile at base 

 yellow, elsewhere short, black. Legs black, with black pile; front 

 tibiae and their metatarsi, on the inner side, with short golden pile ; 

 hind metatarsi incrassate and longer than the three following joints 

 taken together. Wings uniformly subinfuscate ; veins at the outer 

 part of the first posterior and discal cells sinuous and rounded. 



Length 12 millimeters. One specimen. 



Ohrysotoxum derivatum Walker. 



Eight specimens from Colorado, which vary not a little from each 

 other and from Williston's description, They seem to belong here, 



