256 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



femora without cilia below; costa without enlargement. Middle 

 tibiae ^^dth three bristles below, one at basal, two at apical third, 

 their basitarsi with one large bristle above. 



Redescribed from the type material and 10 males. The type 

 specimens were taken at Brookings, South Dakota, June 16, 1891; 

 there are 2 other males in the collection of J, M. Aldrich, 1 taken at 

 Quebec, June 10, 1906, by Beaulieu, the other in Polk County, Wis- 

 consin, in July, by Baker. I have taken males at Rochester, New 

 York, May 29; Fort Erie, Ontario, June 6-July 4; and at Ridge- 

 way, Ontario, June 18, 29. 



Types. — In the collection of J. M. Aldrich. 



No. 188. DOLICHOPUS PALAESTKICUS Loew. 



Dolichopus palaestricus Loew, Cent., vol. 5, 1862, No. 84; Mon. N. Amer. Dipt., 

 pt. 2, 1864, p. 328.— Aldrich, Kansas Univ. Quart., vol. 2, 1893, p. 10, pi. 1, 

 fig. 3. — Melander and Brues, Biol. Bull., vol. 1, 1900, p. 148. 



Male. — Length 4.5-5.5 mm.; of wing 4.5 mm. Face rather nar- 

 row, golden yellow or yellowish white. Front green or blue-green, 

 sometimes with coppery reflections. Antennae wholly black or 

 nearly so; third joint scarcely longer than wide, somewhat conical 

 in outline, obtuse at tip. Lateral and inferior orbital cilia yellow, 

 about five of the upper cilia on each side black. 



Thorax shining green ; dorsum with a little white pollen along the 

 front, sometimes with a median coppery vitta and a coppery spot on 

 each side ; pleurae dulled with white pollen. Abdomen shining green 

 with slight coppery reflections. Hypopygium black; its lamellae 

 large, nearly twice as long as wide, somewhat elliptical, whitish with 

 broad black border on apical margin, which is jagged and bristly on 

 lower half, above this they are fringed with yellow hairs and a few 

 black hairs near the base above. 



Fore coxae yellow, with minute black hairs on their anterior 

 surface, middle and hind coxae black with yellow tips. Femora and 

 tibiae yellow, middle and hind femora each with one preapical 

 bristle, the latter ciliated on lower inner edge with rather scattering 

 yellow hairs, which commence near the middle of the femora and reach 

 nearly to their tips, the longest hairs nearly as long as the width of 

 the femora. Middle tibiae with three or four large bristles below, 

 one pair at apical third and one bristle at basal third, sometimes with 

 another bristle between these, their basitarsi with one large bristle 

 above. Posterior tibiae considerable thickened; inner surface 

 glabrous for two-thirds their length, the usual glabrous stripe on 

 upper surface distinct but a little broken. Fore tarsi (fig. 188a) one 

 and three-fourths times as long as their tibiae; first two joints 

 together about equal to their tibiae in length; second joint a little 

 more than half as long as first and nearly as long as third and fourth 



