154 THE CANADIAN ENTOMOLOGIST 



long as the second. Arista thickened on less than the basal half, 

 the penultimate joint as broad or broader than long. x\ntennal 

 fovea deeply concave. Median facial carina on its upper surface 

 convex, as broad as the third antennal joint at its greatest width. 

 Vibrissse cruciate, situated on a level with the front edge of the 

 oval margin, one or two weak bristly hairs above each. Proboscis 

 shining black, once geniculate. Palpi black, slightly thickened 

 at the tip. Occiput, except the epicephalon, covered with numerous 

 short bristly black hairs. 



Thorax black, brassy-gray pollinose with four distinct sub- 

 shining brownish black vittse, the outer vittae considerably wider 

 than the two median. Bearing three dorso-central bristles (the 

 anterior two, sometimes very weak), and two distinct sterno- 

 pleural bristles. Scutellum rather small, broader at the base, 

 gradually narrowing to a rounded point apically. Bearing a pair 

 of long basal and a single pair of long apical, marginal scutellar 

 bristles. Median discal scutellar bristles weak. 



Abdomen black, brassy-gray pollinose with a distinct median 

 brownish black vitta. Clothed with numerous long sub-erect 

 bristly hairs, which are somewhat stouter in the male. Hypopygium 

 in the male black, pollinose, bearing black bristly hairs, protruding 

 forward beneath the venter. In the female shining black, distended 

 outward, a narrow deep median hollow groove on the dorsum. 

 The outer margin thickly beset with rather long, flattened, pointed 

 spines, directed upwardly. 



Legs black, faintly pollinose. Knees reddish. Middle tibiae 

 each bearing a single short bristle on the outerside below the 

 middle. Hind tibiae with a few short bristles on the outer margin. 

 Last joint of front tarsi slightly longer than the tarsal claws. Pul- 

 villi whitish. 



Wings hyaline with a yellowish tinge at the base. First and 

 third longitudinal veins not bristly. Posterior cross-vein straight. 

 Bend of fourth longitudinal vein right angular, beyond bend 

 approaching the third longitudinal vein in a straight line. Last 

 section of the fifth longitudinal vein much shorter than the pre- 

 ceding section. Calypteres whitish, with a yellowish tinge along 

 the borders. 



Habitat — Saskatchewan, Canada. 



