THE DIPTEROUS GENUS DOLICHOPUS IX NORTH AMERICA. 151 



female at the same place July 5, 1909 (Van Duzee); 1 male at Sud- 

 bury, Ontario, July 22, 1915. 



Type locality. — "Canada." Melander and Brues report it from 

 Massachusetts. 



This species is closely related to pantomimus Melander and Brues, 

 but differs in having the anal angle of the wing rounded off, not at 

 all prominent, fore coxae with a blackish spot at base; the lamellae 

 of the hypopygium are oval or almost quadrilateral in outline; while 

 in pantomimus they are more triangular in form, the fore coxae are 

 wholly yellow in all the specimens I have seen, and the anal angle 

 of the wing is quite prominent. 



No. 103. DOLICHOPUS PANTOMIMUS Melander and Brues. 



Dolichopus pantomimus Melander and Brues, Biol. Bull., vol. 1, 1900, p. 142. — 

 Aldrich, Cat. N. Amer. Diptera, 1905, p. 303. 



Male. — Length 3.5-4.5 mm.; of wing 3-3.5 mm. Face rather nar- 

 row, golden yellow. Front shining green. Antennae wholly black; 

 third joint large, about twice as long as wide, pointed at tip, arista 

 inserted a considerable distance before its tip. Lateral and inferior 

 orbital cilia yellowish, about six of the upper cilia on each side black. 



Dorsum of thorax shining green, sometimes with a median coppery 

 vitta, (in one specimen this median line is deep blue), and with a 

 little white pollen along the anterior edge; pleurae dulled with whit- 

 ish pollen. Abdomen shining green, sometimes with slight coppery 

 reflections, with black incisures and white pollen, which forms spots 

 on the sides of the segments, Hypopygium black; its lamellae (fig. 

 103a) of moderate size, somewhat triangular in outline, but with the 

 apical margin rounded, jagged and bristly, whitish with a rather wide, 

 black, a*pical border. 



Fore coxae wholly yellow with minute pale hairs on the anterior 

 surface. Middle and hind coxae black with yellow tips. Femora 

 and tibiae yellow. Middle and hind femora each with one preapical 

 bristle, the latter ciliate on their lower inner edge with pale hairs fox 

 three-fourths their length, these hairs placed at regular but rather 

 wide intervals and scarcely as long as the width of the femora. 

 Posterior tibiae black at tip; the glabrous stripe on upper surface 

 wide, extending upon the inner side of the tibiae. Fore and middle 

 tarsi yellow, more or less darkened toward their tips. Fore tarsi 

 one and a fourth times as long as their tibiae, the joints of regularly 

 decreasing length. Middle tarsi one and a third times as long as 

 their tibiae, first joint without a bristle. Middle tibiae with one 

 small bristle below. Hind tarsi wholly black. Calypters and hal- 

 teres yellow, the latter with black cilia. 



Wings (fig. 103) tinged with brownish gray; costa with a knotlike 

 enlargement at tip of fifth vein; last section of fourth vein a little 



