THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 123 



its middle ; hind margin of wing not indented at tip of fifth vein ; wing 

 of somewhat equal width; anal angle prominent and with indications 

 of a flattened lobe at tip of sixth vein. 



Female. — Face wide, white, a little tinged with yellow; middle and 

 hind femora each with two, sometimes three bristles before their tips, 

 the latter without cilia below, tarsi about as in the male; middle 

 tibiae with one bristle below, their basitaisi without a bristle above; 

 hind margin of wing rather evenly rounded, a little indented at tip 

 of fifth vein; anal angle prominent, but without any indication of a 

 lobe. 



Described from 1 male and 9 females taken at Beverly, Massa- 

 chusetts, June 4, 1869 (Riley, National Museum); 1 male, which I 

 took at Golden, New York, May 31, 1914; 1 male taken at Sherborn, 

 Massachusetts, May 30; and 1 male from New Brunswick, taken 

 June 21, 1914, by J. D. Tothill. 



7V7>6.— Male, Cat. No. 23017, U.S.N.M., from Beverly, Massa- 

 chusetts. 



No. 79. DOLICHOPUS COMATUS Loew. 



Dolichopus comatus Loew, Neue Beitr., vol. 8, 1861, p. 23; Mon. N. Amer. 

 Diptera, pt. 2, 1864, p. 69. — Aldrich, Kansas Univ. Quart., vol. 2, 1893, 

 p. 14, pi. 2, fig. 25.— Melander and Brues, Biol. Bull., vol. 1, 1900, p. 148. 



Male. — Length 2.5-4.2 mm.; of wing 2.5-4 mm. Face rather 

 narrow, silver white. Front green, dulled with white pollen, especially 

 along the orbits. Antennae wholly black; third joint one and a 

 half times as long as wide, oval, rounded at tip. Lateral and inferior 

 orbital cilia white, the lower ones flattened, about eight of the upper 

 cilia on each side black. Proboscis and palpi blackish. 



Thorax green with green reflections, which usually form a median 

 vitta on the dorsum with a shining green or blue line on each side of it; 

 dorsum a little dulled with almost invisible brownish pollen ; pleurae 

 dulled with white pollen. Abdomen green with narrow black inci- 

 sures and coppery reflections; the white pollen on its sides extending 

 upon the dorsum. Hypopygium black; its lamellae rather small, 

 oval, a little longer than wide, white, with a narrow brown border 

 on apical margin, fringed with delicate pale hairs, a few of those at 

 apex brown. 



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

 anterior surface covered with silvery pollen and with little black 

 hairs on inner edge. 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 a row of 

 delicate little yellow hairs on lower inner edge, and with a more or less 

 conspicuous black spot at tip on upper edge. Posterior tibiae not 

 thickened, black at tip for nearly one sixth their length. Middle 



