140 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



without a bristle above, fourth and fifth of nearly equal length. Hind 

 tarsi wholly black. Calypters, their cilia, and the halteres yellow. 



Wings (fig. 92) grayish; costa with a slight knot-like enlargement 

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

 middle; hind margin of wing a little indented at tip of fifth vein; 

 anal angle rounded, not very prominent. 



Female. — Face wide, silvery white; fore tarsi with the second joint 

 only a little longer than the third, last three joints of nearly equal 

 length; costa without an enlargement; middle tibiae with one bristle 

 below; fore and hind coxae as in the male. 



Described from 18 males and 2 females. I have taken it at Buffalo, 

 New York, June 24; South Wales, Erie County, New York, July 9; 

 Toronto, Ontario, July 3 and 4. H. S. Parish took it at Coniston, 

 Ontario, July 27. A. L. Melander took it at Mica, Washington, 

 July 14; Lake McDonald, Glacier Park, Montana, August 14, and 

 Priest Lake, Idaho, August 1. 



Type.— Male, Cat. No. 23020, U.S.N.M., from Priest Lake, Idaho. 



No. 93. DOLICHOPUS IDONEUS, new species. 



Male. — ^Length 4-4.5 mm.; of wing 3.75-4 mm. Face rather nar- 

 row, silvery white. Front shining green. Antennae black; first 

 joint conspicuously yellow below; third rather large, longer than 

 wide, somewhat oval in outline, pointed at tip. Lateral and inferior 

 orbital cilia whitish, a few of the upper cilia black. 



Thorax green with a very little white pollen along the front of the 

 dorsum, and a distinct bronze vitta between the acrostichal bristles; 

 pleurae dulled with white pollen. Abdomen green with slight cop- 

 pery reflections and black incisures; the spots of white pollen along 

 its sides large. Hypopygium black; its lamellae (fig. 93a) small, 

 somewhat oval in outline, about one and a fourth times as long 

 as wide; white, rather broadly black at apex, narrowly along the 

 upper edge, which has about seven bristle-like hairs placed at regular 

 and rather wide intervals. 



Fore coxae yellow, with a few minute black hairs on inner edge of 

 anterior surface near base, which is otherwise covered with very 

 delicate, minute, yellow hairs, so small as to make the front surface 

 appear nearly bare. 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 the little 

 black hah's on their sides descending to the lower edge, the lower rows 

 on each side a little longer than those on the sides and leaving a broad 

 glabrous stripe between them. Posterior tibiae with their tips black 

 for one-fifth their length, a glabrous line just inside of the inner row of 

 large bristles. Fore and middle tarsi about one and a fourth times as 

 long as their tibiae; the former yellow, scarcely infuscated at tip, 



