THE DIPTEROUS GEKUS DOLICHOPUS IN NORTH AMERICA. 289 



fifths as long as first, third three-fourths as long as second, fourth 

 about one-fourth as long as third, and about equal to fifth in length, 

 very slightly widened at tip; middle and hind tarsi more than one 

 and one-fourth times as long as their tibiae, darkened toward their 

 tips, but not black; posterior basitarsi with two large bristles above. 

 Calypters and halteres pale yellow, the former with black ciHa. 



Wings (fig. 212) grayish, usually with a yellowish tinge which is 

 more conspicuous along the front of the wing; veins yellowish 

 brown; costa yellow on inner edge with a small knot-like enlarge- 

 ment at tip of fourth vein ; last section of fourth vein bent before its 

 middle; hind margin of wing a little indented at tip of fifth vein, 

 nearly evenly rounded, the anal angle being obsolete. 



Female. — -Face wider than in the male, silvery white; hind femora 

 without cilia, but with minute white hairs on lower half; fore tarsi 

 plain, about one and one-third times as long as their tibiae; all tarsi 

 only a little darkened toward their tips; costa without an enlarge- 

 ment at tip of fifth vein; anal angle of wing more prominent than in 

 the male, still it is rounded off. 



Redescribed from the type material and 6 males and 1 female. 

 Two males and the female were taken at Fayetteville, Arkansas, July 

 30-August 15; 1 male at Lawrence, Kansas; 2 males in Erie County, 

 New York (1 at East Aurora, July 12; 1 on Grand Island, August 18) ; 

 and 1 male at Niagara Falls, New York, July 20. 



Type locality — ^Middle States. 



Type. — ^Museum of Comparative Zoology, Cambridge, Massa- 

 chusetts. 



No. 213. DOLICHOPUS LONGIPENNIS Loew. 



Dolichopus hngipennis Loew, Neue Beitr., vol. 8, 1861, p. 13; Mon. N. Amer. 

 Dipt., pt. 2, 1864, p. 57. — Aldrich, Kansas Univ. Quart., vol. 2, 1893, p. 13, 

 pi. 1, fig. 8.— Melander and Brues, Biol. Bull., vol. 1, 1900, p. 148. — ^John- 

 son, Bull. Amer. Mus. Nat. Hist., vol. 32, 1913, p. 64. 



Hale. — Length, 5-6 mm.; of wing, 6-7 mm. Face rather wide, a 

 little narrowed below, silvery white, more or less tinged with yellow 

 above. Front green, sometimes with blue reflections, shining but 

 with thick gray pollen along the orbits. Antennae yellow; third 

 Joint more or less blackened at tip, a little longer than wide, obtusely 

 ]3ointed. Lateral and inferior orbital cilia pale yellow, about eight 

 of the upper cilia on each side black. 



Thorax green, usually with a narrow median and wide lateral 

 stripes of a bronze or coppery color on the dorsum; pleurae dulled 

 with white pollen. Abdomen green with coppery reflections; the 

 white pollen on its sides abundant and reaching upon the dorsum. 

 Hypopygium black; its lamellae of moderate size, somewhat ellipti- 

 cal, nearly twice as long as wide, white with a wide black border on 



