150 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



No, 102, DOHCHOPUS MELANOCERUS Loew, 



Dolichopus melanocerus Loew, Cent., vol. 3, No. 86; Mon. N. Amer. Dipt., ])(. 2 

 p. 330. — ^Melander and Brues, Biol. Bull., vol. 1, p. 148. 



J/«Ze.— Length 4 mm.; of wing the same. Face rather wide, 

 covered with coarse yellow pollen. Front shining green, sometimes 

 coppery in the center. Antennae wholly black ; third joint oval, about 

 one and a fourth times as long as wide, usually broadly rounded at 

 tip, but sometimes quite pointed. Lateral and inferior orbital cilia 

 whitish, a few of the upper cilia black. 



Thorax shmmg green with coppery reflections, especially between 

 the acrostichal bristles; pleurae dulled with grayish pollen. Abdo- 

 men shinmg green with black mcisures and coppery reflections, its 

 sides dulled with white pollen. Hypopygium black; its lamellae (fig, 

 102a) of moderate size, oval or subquadrilateral in outline, whitish 

 with wide black border on the apical margm, which extends narrowly 

 along the upper and lower edges, jagged and bristly at apex, frmged 

 with rather long brown hairs on upper edge. 



Fore coxae yellow with a rather large blackish spot at base on outer 

 side, their anterior surface clothed with minute blackish hairs, which 

 appear yellowish in certain lights. Middle and hind coxae black 

 almost to their tips. Femora and tibiae yellow. Middle and hmd 

 femora each with one preapical bristle, the former also has a small 

 bristle on the posterior side near the tip in the type specimen, the 

 latter ciliated on lower inner edge with yellow hairs, the longest of 

 which are about as long as the width of the femora. Posterior tibiae 

 with black tips, the glabrous stripe on upper surface broad and 

 extending upon the mner side which is largely glabrous. Fore and 

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

 the tip of the first joint. Hind tarsi wholly black. Calypters and 

 halteres 3"ellow, the former with black cilia. 



Wuigs (fig. 102) tinged with brownish gray; costa with a small 

 knotlike enlargement at tip of first vein; last section of fourth vein 

 bent before its middle; hind margm of wing only slightly indented at 

 tip of fifth vein; anal angle rounded, not at all prominent. 



Female. — Face twice as wide as in the male, whitish, tinged a little 

 with yellow on the upper part; third antennal joint about as long as 

 wide; hind femora without cilia; the glabrous stripe on hind tibiae 

 confined to the space between the rows of large bristles; costa with- 

 out enlargement; the fore coxae are blackened at base as in the male; 

 otherwise as in the male. 



Redescribed from the single type specimen and 5 males and 2 

 females taken as follows: 2 males and 1 female at New Bedford, 

 Massachusetts (Hough), May 20, 1896; 1 male at Montreal, Quebec, 

 July 7, 1906; 2 males at Kearney, Ontario, July 29, 1911, and 1 



