THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 269 



first joint, whicb is about as long as the three following joints taken 

 together; third and fifth of nearly equal length, fourth a little shorter, 

 third only a little shorter than second; middle basitarsi with a large 

 bristle before its apical third, their tibiae with three bristles below, 

 two near apical third and one a little before the middle (I can not 

 see these bristles in the male, still they may be broken ofl"); hind 

 margin of wing more rounded than in the male, making the wing a 

 little wider in the middle. 



Described from 2 males and 3 females which I took in California; 

 1 at the foot of Portrero Grade, on Cottonwood Creek, San Diego 

 County, April 21; the others on the Los Angeles River, Los Angeles, 

 Mays. 



Ilolotype and allotype. — In the United States National Museum. 



Type.— Male, Cat. No. 23056, U.S.N.M. 



No. 197. DOLICHOPUS COQUILLETTI Aldrlch. 



Dolichopus coquilletti Aldrich, Kansas Univ. Quart., vol. 2, 1893, p. 19, pi. 1, 

 fig. 17.— Melander and Brues, Biol. Bull., vol. 1, 1900, p. 148. 



Male. — Length 5 mm.; of whig the same. Face moderately wide, 

 slightly narrowed below, silvery white. Front green with bronze 

 reflections, usually mostly bronze colored. First antennal joint yel- 

 low with a black upper edge, second and third joints black, third not 

 much longer than wide. Lateral and inferior orbital cilia white, 

 about eight of the upper cilia on each side black. 



Thorax green; dorsum somewhat dulled with grayish pollen and 

 usually with a median copper37^ vitta; pleurae with white pollen. 

 Abdomen green with coppery reflections; the white pollen on its 

 sides abundant and extending upon the dorsum; sides of the first 

 segment with long, slender, bent, black hairs which sometimes 

 appear pale in certain lights. Hypopygium black; its lamellae large, 

 somewhat elliptical, but tapering into the stem, twice as long as wide, 

 whitish with wide black border on apical margin, which is jagged 

 and bristly at the lower corner, fringed above with delicate brownish 

 hairs. 



Fore coxae yellow with a small blackish spot at base on outer side, 

 their anterior surface covered with little black hairs, except the 

 upper outer corner, where the hairs are minute and yellow. Middle 

 and hind coxae black with yellow tips. Femora and tibiae yellow. 

 Middle and hind femora each with one preapical bristle, the latter 

 without cilia below, but with minute yellow hairs on lower inner 

 edge. Fore tibiae with four large bristles above and three below. 

 Middle tibiae with a pair of large bristles at apical third below and 

 rarely a smaller one near basal third, their basitarsi with a large 

 bristle above at apical third. Posterior tibiae only slightly thickened ; 

 the large bristles on upper edge rather long, the outer row with eight, 

 187329—21 18 



