THE DIPTEKOUS GENUS DOLICHOPUS IN NORTH AMERICA. 127 



Wings grayish, strongly tinged with brown in front of third vein 

 and narrowly so along the veins; costa with a small elongated en- 

 largment at tip of first vein; last section of fourth vein moderately 

 bent near its middle; tip of third and fourth veins rather far apart; 

 hind margin of wing scarcely indented at tip of fifth vein; anal angle 

 rather prominent. 



Redescribed from the single type specimen in the United States 

 National Museum, which was taken on Popoff Island, Alaska, July 

 11, 1899, by T. Kincaid. ■ 



Type.— Male, Cat. No. 5235, U.S.N.M. 



No. 82. DOLICHOPUS PACHYONEMUS Loew. 



Dolichopus pachycnemus Loew, Neue Beitr., vol. 8, 1861, p. 13: Mon. N. Amei. 

 Dipt., pt. 2, 1864, p. 35.— Aldrich, Kansas Univ. Quart., vol. 2, 1893, p. 9, 

 pi. 1, fig. 12. -Melander and Brues, ;Biol. Bull., vol. 1, 1900, p. 148. 



Male. — Length 5.5-5.75 mm.; of wing 4.5 mm. Face wide for a 

 male, dark ochre yellow, dulled with pollen. Front usually blue or 

 violet edged witn green, sometimes mostly green, shining. Antennae 

 (fig. 82) black; first joint sometimes a little yeUowish below; third 

 joint about as long as wide, somewhat oval in outline, rather rounded 

 at apex. Orbital cilia wholly black. 



Thorax dark shining green, with a rather broad bronze vitta in 

 the center of the dorsum; pleurae dulled with grayish poUen. Ab- 

 domen dark shining green with black incisures and spots of white 

 pollen on the sides of the segments. Hypopygium black; its lamellae 

 (fig. 82a) rather large, somewhat orbicular in outline, still with the 

 outer corner nearly a right angle, whitish with wide black border at 

 apex and narrow border above and on apical half of lower edge, 

 jagged and bristly on apical margin, fringed above with rather long 

 black hair. 



Coxae black with their tips narrowly yellow; anterior pair covered 

 with black hairs on the front surface. Femora and tibiae yellow. 

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

 with rather long hair above near the base and long black cilia on 

 apical half of lower inner edge, the longest hairs being fully as long as 

 the width of the femora. All tibiae with rather numerous and strong 

 bristles; posterior pair (fig. 826) with their apical half or more black, 

 much thickened, and with a groove on upper surface which reaches 

 from the tip to basal two-fifths, it is forked near the middle of the tibiae 

 and yellowish in color. Fore tarsi (fig. 82c) a little longer than their 

 tibiae, first three joints yellow, usually with their tips brown, third a 

 little compressed and widened at apex; fourth and fifth joints black, 

 compressed and fringed above with little black hairs, fourth about as 

 wide at apex as it is long, fifth nearly round in outline, last three 

 joints of nearly equal length. Middle tarsi scarcely as long as their 



