THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 95 



yellow and without a bristle above. Hind tarsi wholly black. 

 Calypters and halteres yellow, the former with black cilia. 



Wings (fig. 52) rather dark grayish; costa with a small knot-like 

 enlargement at tip of first vein ; last section of fourth vein bent before 

 its middle, nearly straight and parallel with third beyond the bend, 

 the third being only slightly bent backward at tip; hind margin of 

 wing not indented at tip of fifth vein; anal angle of wing moderately 

 prominent. 



Female. — Agrees with the male in general color and in the forma- 

 tion of the wings and legs; the face is wide and dark grayish; the 

 thu'd antennal joint is a little pointed at tip. 



Redescribed from 4 males and 1 female; 1 of the males was taken 

 in Colorado, by Baker; all the other specimens were taken in 

 Labrador; 1 male at Ungava Bay, July 29, by L. M. Turner (National 

 Museum); the others, from the collection of C. W. Johnson, were 

 taken at Nain, August 18, by Owen Bryant. 



There seems to be no doubt of the determination of these specimens. 



Type. — In the University of Lund, Sweden. 



No. 53. DOLICHOPUS INCONGRUUS Wheeler. 



Dolichopus incongruus Wheeler, Psyche, vol. 5, 1890, p. 338. 



Male. — Length 4.5-5 nun.; of wing 4.25-4.75 mm. Face narrow, 

 silvery white. Front green or blue-green, shining. Antennae 

 wholly black; third joint three times as long as wide, pointed at tip. 

 Proboscis and palpi black with black hairs. Orbital cilia wholly 

 black. 



Thorax bright green, shining, dorsum, with blue and bronze reflec- 

 tions, the latter forming more or less distinct vittae; pleurae more 

 black, dulled with brownish gray pollen. Abdomen shining green 

 with blue or bronze reflections. Hypopygium black; its lamellae 

 (fig. 53a.) small, somewhat triangular in outline with the apex rounded 

 and not jagged, fringed with delicate hairs, whitish with a black 

 border. 



Coxae black with yellow tips; anterior pair with white pollen and 

 little black hairs on the front side. Basal two-thirds of fore femora 

 black, apical third yellow. Middle femora yellow, sometimes a little 

 blackened at base on upper and lower edges. Hind femora black 

 with yellow tips, not ciliated below, with a few longer hairs at base 

 on upper edge. Middle and hind femora each with one preapical 

 bristle; tibiae yellow, posterior pah a little stouter than the others, 

 with the apical third black, the black sometimes extending nearly 

 to their middle on inner side, not sharply defined and with an elon- 

 gated brown spot at basal third of inner side; the glabrous stripe on 

 upper surface distinct and extending inside of the inner row of 



