60 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



longer than the antenna, uiserted at about the middle of the third 

 joint. Orbital cilia wholly black, rather long except a few near the 

 proboscis which are shorter. 



Thorax blackish with green reflections and dulled with brown 

 pollen on the dorsum, which leaves ill defined, shining vittae; 

 pleurae with grayish pollen. Abdomen dark green with black 

 incisures and spots of white pollen on the sides of the segments. 

 Hypopygium black; its lamellae (fig. 22a) rather large, somewhat 

 elliptical in outline but truncate at apex, not quite twice as long as 

 wide, dark yellowish or brownish, shading into a broad apical border 

 of a blackish color (sometimes the lamellae are of a more whitish 

 color), jagged and bristly at apex. 



Coxae, legs, and feet black, trochanters and knees yellow. Fore 

 coxae with black hairs. Middle tibiae with the middle third white 

 and with five bristles below, their basitarsi white, narrowly black at 

 tip, the white portion with silvery pollen on its anterior surface. 

 Middle and hind femora each with one preapical bristle, the latter 

 ciliated with black hairs, the longest of which are longer than the 

 width of the femora, those near the base much shorter. Posterior 

 tibiae a little thickened near the base and at tip, a little more slender 

 in the middle, their bristles long. Fore tarsi fully one and a half 

 times as long as their tibiae, their joints of decreasing length, first 

 joint nearly as long as the three succeeding joints taken together. 

 Middle tarsi one and a fourth times as long as their tibiae. Calypters 

 and halteres yellow, the former with black cilia. 



Wings (fig. 22) grayish; costa enlarged at tip of first vein, graduUy 

 tapering to its tip; last section of fourth vem a little bent near its 

 middle, at this bend and on the cross-vein there is an almost imper- 

 ceptible brown shade; hind margin of wing scarcely indented at 

 tip of fifth vein; anal angle rounded. 



Female. — Face wider than in the male; third antennal joint about 

 as long as wide; fore and middle tarsi about one and a fourth times 

 as long as their tibiae; white on middle tibiae and basitarsi usually 

 more obscure; costa not enlarged at tip of first vein. Middle basi- 

 tarsi with one bristle above and several smaller ones below; these 

 are more prominent in the male. 



Redescribed from several males and females from Alaska and 

 Labrador: Sitka, Alaska, June 16, 1899, by T. Kincaid (Harriman 

 Exped.) ; Caribou Island, Labrador, taken by Packard and in the 

 Museum of Comparative Zoology in Cambridge, Massachusetts; 

 Labrador, coll. of C. W. Johnson; Ungava Bay, Labrador, taken by 

 L. M. Turner, on July 29; and one female Morrison took in the 

 White Mountains, New Hampshire; all but the Packard material in 

 the United States National Museum. 



