THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 01 

 No. 41. DOLICHOPUS AEQUALIS, new species. 



Male. — Length 4 mm.; of wing the same. Face narrow, silvery 

 w^hite. Front shining green with a little brown pollen visible on 

 lower part when viewed in certain directions. Antennae (fig. 41 &) 

 wholly black; third joint a little longer than wide, somewhat conical 

 in outline. Orbital cilia wholly black, except that there are from two 

 to five 3 ellowish bristles on each side near the proboscis. 



Thorax shining green, sometimes with an indistinct median cop- 

 pery vitta; pleurae slightly dulled with grayish pollen. Abdomen 

 dark green, its incisures black, the w'hite pollen on the sides confined 

 to the extreme lower edge of the dorsum. Hypopygium black with 

 green reflections; its lamellae (fig. 41a) large, whitish with a narrow 

 black border, but the apical half appearing blackish on inner side 

 on account of the little black hairs on its surface, outer portion some- 

 what oval and at nearly right angles to the stem, jagged on outer 

 edge and fringed with rather long hairs. 



Coxae and femora black, the latter with yellow tips. Middle and 

 hind femora each with one preapical bristle, the latter with a fringe 

 of short brown hairs below; these hairs are delicate and scarcely as 

 long as the row of black hairs on upper edge of basal half. Tibiae 

 yellow: posterior pair with black tips. Fore tarsi (fig. 41&) about 

 one and a fourth times as long as their tibiae, brownish, becoming 

 black at tip, still a little yellowish at base; first joint about as long 

 as the three succeeding joints taken together, second and third joints 

 of nearly equal length, fourth and fifth joints, also of nearly equal 

 length but shorter than the preceding ones; last three joints slightly 

 compressed and gradually widened; pulvilli white, conspicuous. 

 Middle tarsi about one and a fourth times as long as their tibiae, black 

 with the base of the first joint yellowish. Hind tarsi wholly black. 

 Calyj)ters and halteres yellow, the former \Nith black cilia. 



Wings (fig. 41) grayish; costa not enlarged at tip of first vein; last 

 section of fourtJi vein a little bent at about its basal third; hind mar- 

 gin of wing scarcely indented at tip of fifth vein; anal angle rounded, 

 not very prominent. 



Female. — Face broad, silvery white; hind femora with a row of 

 rather long hairs on lower inner edge, but these are not as long as 

 in the male. It agrees with the male in having one large bristle 

 below on middle tibiae, the basitarsi being without a bristle above, 

 ill having the yellow bristles near the proboscis and in the wing form. 

 The fore tarsi are scarcely longer than their tibiae and not noticeably 

 compressed. 



Described from specimens taken by me in Erie County, New 

 York; 4 males and 1 female were taken at Colden, July 4, and August 



