180 BULLETIN" 116, UNITED STATES NATIONAL MUSEUM. 



wide as long; fifth joint black, much compressed and widened, scarcely 

 as long as the first but longer than the second, not quite as wide as 

 long, somewhat oval in outline, fringed above with little black hairs; 

 the white, pulvilli quite conspicuous. Middle tarsi one and a fourth 

 times as long as their tibiae, black from the tip of the first joint, 

 which has a large bristle on upper surface and a smaller one on the 

 anterior upper edge. Hind tarsi wholly black. Calypters and 

 halteres yellow, the former with black cilia. 



Wings (fig. 125) grayish, sometimes a little tinged with brown in 

 front or along the veins; costa slightly enlarged at tip of first vein; 

 last section of fourth vein a little bent beyond its basal third; third 

 vein bent a little backward at tip; hind margin of wing a little in- 

 dented at tip of fifth vein; wing rather narrow and of nearly equal 

 width, the anal angle being prominent. 



Female. — Face wide, grayish white; fore tarsi plain, usually with 

 only the last joint black, fifth joint nearly twice as long as fourth, 

 first longer than the three following joints taken together; hind 

 tibiae scarcely at all thickened, its apical fifth black, but this black 

 shading into the yellow, so they are sometimes infuscated almost 

 from their middle ; otherwise about as in the male. 



Redescribed from several males and females from the following 

 locations: Polk County, Wisconsin, July, taken by Baker; Brook- 

 ings, South Dakota, June 16, taken by J. M. Aldrich; White Moun- 

 tains, New Hampshire, taken by Morrison; Ottawa, Canada, July; 

 I have taken it at East Aurora, New York, June 2, and at Ridgway, 

 Ontario, July 15. 



Type locality. — ^Milwaukee County, Wisconsin; Aldrich reports it 

 from South Dakota and Colorado ; Melander and Brues from. Illinois. 



No. 126. DOLICHOPUS BBFRACTUS Loew. 



Dolichopus bifractus Loew, Neue Beitr., vol. 8, 1861, p. 19; Mon. N. Amer. 

 Dipt., pt. 2, 1864, p. 53.— Aldrich, Kansas Univ. Quart., vol. 2, 1893, p. 12, 

 pi. 1, fig. 14; Biologia Centrali-Americana, Dipt., vol. 1, 1901, p. 333. — John- 

 son, Insects of New Jersey, 1909, p. 757. 



Male. — Length 4-5.5 mm. ; of wing 4-5 mm. Face wide, white 

 to yellowish gray, being quite variable in color. Front gi-een, 

 covered with yellowish gray pollen which often conceals the ground 

 color. Antennae yellow; third joint brown at tip, longer than wide, 

 conical, with a distinct swelling at the insertion of the arista, which is 

 black. Lateral and inferior orbital cilia yellowish, about six of the 

 upper cilia on each side black. 



Thorax green with bronze reflections ; dorsum covered with yellow- 

 ish brown pollen with often conceals the ground color; pleurae with 

 abundant white pollen. Abdomen green with bronze reflections; 

 the pollen on its sides more gray than in most species and extending 

 upon the dorsum. Hypopygium black; its lamellae of moderate 



