THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 147 



joint, which is scarcely as long as the remaining four joints taken 

 together; third and fifth joints of equal length, about two thirds as 

 long as the second and a very little longer than the fourth. Middle 

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

 the tip of the first joint, which has no bristle on its upper surface. 

 Hind tarsi wholly black. Calypters and halteres yellow, the former 

 with black cilia. 



Wings (fig. 99) tinged with brownish gray; costa rather thick from 

 the tip of the first vein and tapering to its tip, still the costa could 

 not be called enlarged at tip of first vein; last section of fourth vein 

 only slightly bent at a point beyond its basal third; hind margin of 

 wing scarcely indented at tip of fifth vein, rather evenly rounded, 

 the anal angle not being developed. 



Eedescribed from the single female type specimen, which was 

 taken by J. M. Aldrich at Brookings, South Dakota, June 18, 1891, 

 and is in his collection. 



No. 100. DOLICHOPUS RAMIFER Loew. 



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

 pt. 2, 1864, p. 52. — Aldrich, Kansas Univ. Quart., vol. 2, 1893, p. 12. — 

 Melander and Brues, Biol. Bull., vol. 1, 1900, p. 148. — Johnson, Insects 

 of New Jersey, 1909, p. 756. 



Male. — Length 3-4.5 mm.; of wing 3-4 mm. Face wide, white, a 

 little narrowed below. Front bluish black, usually with purple 

 reflections, very shining. Antennae black; first joint usually a 

 little yellowish on the lower apical corner; third joint nearly two and 

 a half times as long as wide, nearly straight above, broadly rounded 

 below, pointed at tip, arista inserted a little before the point. Palpi 

 yellow. Lateral and inferior orbital cilia whitish, a few of the 

 upper cilia black. 



Dorsum of thorax and the abdomen dark bronze brown with 

 slight green or reddish coppery reflections; pleurae more green with 

 whitish pollen, one male from Colorado is wholly dark shining green, 

 second and third abdominal segments with conspicuous white hairs 

 on their sides. Hypopygium black, short and stout; its lamellae 

 (fig. 100a) small, somewhat triangular or perhaps they could be 

 called crescent-shaped, whitish with a narrow black border on the 

 rounded apical margin, which is scarcely jagged but fringed with 

 brown hairs. 



Fore coxae yellow, blackened at base on outer side, anterior 

 surface with little black hairs. Middle and hind coxae black with 

 yellow tips. Femora and tibiae yellow. Middle femora usually 

 with two, hind femora with one preapical bristle, the latter ciliated 

 on lower inner edge with a few delicate whitish hairs, the longest of 

 which are nearly as long as the width of the femora. Posterior 

 tibiae thickened, black at tip for one fourth their length; the usual 



