108 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



No. 64. DOLICHOPUS HUMILIS, new species. 



Male. — Length 4.5 mm.; of wing 4.25 mm. Face wide, covered 

 with whitish pollen. Front greenish black with a little brown pollen 

 below. Antennae wholly black; first joint unusually long but not 

 thickened; second joint rather long, slender at base, wider at tip; 

 third joint but little longer than wide, scarcely as long as the first 

 joint; rounded at tip; cilia of lower orbit white. 



Thorax blackish, scarcely tinged with green, a little dulled with 

 brown pollen. Abdomen dark green. Hypopygium black; its la- 

 mellae rather large, oval, whitish, with rather wide black margin. 



Coxae black with yellow tips; anterior pair with white hairs on 

 front surface, and a few black ones along inner edge. Anterior 

 femora black at base, becoming yellow toward the apex; (middle 

 tibiae missing, but likely to be yellow) ; hind femora yellowish, darker 

 at base. Tibiae yellow; posterior pair with their tips black for one- 

 fifth their length and a little swollen. Fore tarsi about as long as 

 their tibiae, black from the tip of the first joint, fourth and fifth 

 joints of about equal length; hind tarsi wholly black, Calypters and 

 halteres yellow, the former with white cilia. 



Wings a little grayish; costa with a large elongated enlargement 

 at tip of first vein; last section of fourth vein with a rather sharp bend 

 at its basal third; hind maigin of wing scarcely indented at tip of 

 fifth vein; anal angle rather prominent; outer part of wing very 

 wide, the wing being narrowed at base. 



Described from 1 male taken on the Alaska- Yukon boundary, 

 longitude 141°; latitude 69° 20', August 4-8, 1912, by J. M. Jessup. 



This species is remarkable for the long, slender first antennal joint, 

 which separates it from all related species known to me. 



Typg.— Male, Cat. No. 23011, U.S.N.M. 



No. 63. DOLICHOPUS BREVICAUDA, new species. 



Male. — Length 4 mm.; of wing 3.5 mm. Face wide, only a little 

 narrowed below, white. Front shining green. Antennae (fig. 656) 

 wholly black; third joint not longer than wide, a little pointed at tip. 

 Lateral and inferior orbital cilia whitish, about ten of the upper cilia 

 on each side black. 



Thorax shining green with bronze reflections; pleurae a little didled 

 with white poUen. Abdomen green with coppery reflections and 

 white pollen, which is rather thick on its sides. Hypopygium black, 

 small, not much longer than its small lamellae (fig. 65a) which are 

 yellowish with rather narrow black border on apical margin, they are 

 somewhat triangular in outline, but with the upper angle rounded. 



Coxae black with their extreme tips yellowish; anterior pair with 

 minute black hairs on the front surface. Fore femora black with 



