144 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



times as long as their tibiae, black from the tip of the first joint, 

 anterior pair with the first joint as long or slightly longer than the 

 two following taken together, second to fifth joints of regularly 

 decreasing length. Hind tarsi wholly black. Calypters and hal teres 

 yellow, former with black cilia. 



Wings (fig. 9fi) grayish; costa with a very small knotlike enlarge- 

 ment at tip of first vein; last section of fourth vein a little bent 

 beyond its middle; hind margin of wing scarcely indented at tip of 

 fifth vein; anal angle but little developed. 



Female. — Probably the females with the cilia of the calypters 

 black that I have placed with socius Loew are the females of this 

 species, as some of them had yellowish cilia and others black. 



Described from five males. One taken at East Aurora, New 

 York, July 29; one at Niagara Falls, New York, July 20; one at 

 Niagara Falls, Ontario, July 20; and two at Toronto, Ontario, July 4. 



This form is almost like socius, var, gladius, differing from that in 

 the color of the cilia of the calypters. 



Type.— Male, Cat. No. 23024; U.S.N.M., from Toronto. 



No. 97. DOLICHOPUS ABBREVIATUS, new species, 



Hale. — ^I.ength, 4 mm.; of wing the same. Face wide, silvery 

 gray, scarcely narrowed below. Front shining green. Antennae 

 black; first joint conspicuously yellow below; third joint moderately 

 large, a little longer than wide, somewhat conical in outline, pointed 

 at tip. Lateral and inferior orbital cilia yellowish, about five of the 

 upper cilia on each side black. 



Thorax green with coppery reflections, a little dulled with grayish 

 pollen; pleurae with white pollen. Abdomen green with coppery 

 reflections along the hind margins of the segments; the white pollen 

 on its sides abundant. Hyjjopygium black; short but about as 

 thick as usual; its lamellae (fig. 97) small, somewhat triangular in 

 outline, but rounded at tip, yellowish with a rather narrow black 

 border on the apical margin, which is a little jagged and bristly. 



Fore coxae in the allotype wholly yellow, in the other specimen they 

 are blackened at base on outer side, their anterior surface covered 

 with silvery pollen and little yellow hairs; there are a few small 

 black hairs on the 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 not ciliate below, but with 

 the little black hairs descending to the lower edge of both outer 

 and inner sides. Posterior tibiae scaicelj" thickened, narrowly black 

 at tip; the glabrous stripe between the large bristles not conspicuous. 

 Fore tarsi plain, a little longer than their tibiae, infuscated from the 

 tip of the first joint, which is as long as the three following taken 

 together; fifth joint very slightly longer than the fourth. Middle 



