142 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



about equal to^ third in length ; middle tarsi black from the tip of the 

 first joint; hind tarsi wholly black. Calypters and halteres yellow, 

 the former with black cilia, usualh^ with a few of the upper ones 

 yellowish. 



Wings grayish; costa scarcely thickened at tip of first vein; last 

 section of fourth vein a little bent before its middle; hind margin of 

 wing scarcely indented at tip of fifth vein, rather evenly rounded, 

 but the wing quite narrow; anal angle not developed. 



Female. — Face wide, white; fore tarsi yellowish, black from the 

 middle of the third joint, but the black not diStmctly defined; last 

 three joints of nearly equal length; wings tinged with browTi in front, 

 more broadly rounded tban in the male, anal angle more developed. 

 In both male and female the middle tibiae have tliree bristles below, 

 one at basal, two at apical third, their basitarsi usually with a rather 

 small bristle above at apical third. 



Described from 7 males and 2 females. T. M. Willing took 1 at 

 Regina, July 1 ; I took 5 at Kearney, Ontario, July 2-8; J. M. Aldrich 

 took 2 at Erwm, South Dakota, in June, 1908, and 1 on Turtle Moun- 

 tains, near Bottineau, North Dakota, June 21, 1918. 



Type and allotype in the United States National Museum, taken 

 at Kearney, Ontario. 



Type.— Male, Cat. No. 23022, U.S.N.M. 



No. 95. DOLICHOPUS ACUTUS, new species. 



Male. — Length 4.25 mm.; of wing 3.5 mm. Face moderately 

 wide, silvery white. Front green with bronze reflections. Antennae 

 (fig. 95a) with the first joint yellow, a little darker on upper edge 

 when viewed from the inner side, but the outer side has the upper 

 edge deep black; this black nearly reaches across the apical end of the 

 joint and is sharply defined; third joint nearly three times as long as 

 wide, tapering into a rather acute point; arista subapical, inserted 

 just above the point. Palpi pale yellow with yellowish hairs. 

 Lateral and inferior orbital cilia white, about six of the upper cilia 

 on each side black. 



Thorax shining green with coppery reflections ; pleurae dulled with 

 white pollen, Abdomen shining green with coppery reflections, the 

 apical segments mostly coppery; the white pollen on its sides rather 

 abundant. Hypopygium black, its lamellae large, nearly as long as 

 the hypopygium, elliptical, yellowish at base, becoming white. They 

 have a broad black border on apical margin, where they are a little 

 jagged and bristly, otherwise they are fringed with delicate brown 

 hairs. 



Fore coxae wholly yellow, their anterior surface covered with 

 silvery pollen and minute white hairs. Middle and hind coxae black 

 with yellow tips. Femora and tibiae yellow. Middle and hind 



