THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 225 



femora each with a row of bristles of increasing size, ending in the 

 usual preapical bristle, the latter almost bare below. Posterior 

 tibiae a very little thickened and compressed, with a shallow glabrous 

 groove on inner surface. Fore and middle tarsi about as long as 

 their tibiae; first joint a little shorter than the remaining four taken 

 together, fourth joint scarcely shorter than the fifth. Hind tarsi a 

 little longer than their tibiae. All tarsi black from the tip of the 

 first joint. Calypters and halteres yellow, the former with black 

 cilia. 



Wii'gs (fig. 162) grayish, brownish in front of third vein; costa 

 stout with a knot-like enlargement at tip of first vein; last section of 

 fourth vein rather sharply bent a little beyond its basal third; hind 

 margin of wing notched at tip of fifth vein, which is sharply bent 

 toward the wing marghi; anal angle rounded; wing of normal shape, 

 everly rounded behind. 



Female. — Face wider and antennae smaller than in the male; 

 middle femora with one preapical bristle; wing as in the male, except 

 that the costa is not enlarged at tip of first vein. Middle tibiae with 

 two large bristles below, their basitarsi without a bristle above. 



Described from 6 males and 4 females taken at Newport, Oregon, 

 August 13, 1902, at seepage just above the sea beach, by J. M, Aldrich. 



r^pe.— Male, Cat. No. 23046, U.S.N.M. ' 



No. 163. DOLICHOPUS IDAHOENSIS Aldrich. 



Hygroceleuthiis idahoensis Aldrich, Kansas Univ. Quart., vol. 2, 1893, p. 154. — 

 Melander and Brues, Biol. Bull., vol. 1, 1900, p. 133, figs. 



Male. — Lergth 5-5.2 mm.; of wing 4.8-5 mm. Face rather wide, 

 long, reachii g the lower corner of the eye, silvery white; the yellow 

 ground color shows through on the lower part, the ground color is 

 probably more brown above. Front shining green. Antennae 

 black; first joint of normal size, first and second yellow below; third 

 joint about as long as wide, obtusely pointed at tip. Lateral and 

 inferior orbital cilia silvery white, becoming flattened below, about 

 ten of the upper cilia on each side black. 



Thorax shining green, but slightly dulled with white pollen, some- 

 times with bronze reflections ; pleurae with a little more white pollen 

 than the dorsum. Abdomen green with coppery reflections on the 

 hind margins of the segments, and large spots of white pollen on its 

 sides. Hypopygium black, with green reflections; its lamellae of 

 moderate size, somewhat oval, white with narrow black border on 

 apical and upper margins, a little jagged and bristly at apex, fringed 

 above with little black hairs. 



Fore coxae yellow with a green stripe on outer posterior edge, 

 anterior surface covered with silvery pollen and very minute white 

 hairs, there are some little black hairs along inner edge. Middle and 



