102 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



black with yellow tips; middle femora yellow, blackened at base for 

 one-fourth to one-third their length. Middle and hind femora each 

 with one preapical bristle, the latter not ciliated below. Tibiae 

 yellow; posterior pair black at tip for one-fifth their length, this black 

 rather sharply defined, the glabrous stripe on upper surface broad, 

 extending well upon the inner side and including the inner row of 

 large bristles; they are slightly swollen on inner side near the middle. 

 Fore tarsi as long as their tibiae, mostly yellow, but darker from the 

 tip of the first joint. Middle tarsi about equal to their tibiae in 

 length, black from the tip of the first joint. Cal)"pters and halteres 

 pale yellow, the former with white cilia. 



Wings (fig. 58) a little grayish; costa with a ver}- small knotlike 

 enlargment at tip of first vein; bend in last section of fourth vein 

 small and near its basal third; beyond this bend the third and fourth 

 veins are parallel and straight; hind margin of wing not indented at 

 tip of fifth vein; anal angle rounded, not very prominent, the wings 

 of somewhat parallel width. 



Female. — Face wide, silvery white; front sometimes violet; third 

 antennal joint only a little longer than wide; middle femora black 

 with apical fourth yellow; hind tibiae black at tip for one-third to 

 three-fourths of their length, and on inner side nearly to the base; 

 sometimes black with the base yellow on upper edge to near the 

 middle; the black is never well defined; cilia of calypters usually 

 more or less black but with some yellow or white hairs, sometimes 

 wholly white. 



Redescribed from 4 males and 3 females; 1 pair was taken at 

 Battle Creek, Michigan, by J. M. Aldrich; 1 male at New Bedford, 

 Massachusetts, May 17 (Hough); 1 female at Toronto, Ontario, 

 May 16 (all these are in the collection of J. M. Aldrich) ; 2 males and 

 1 female at Beverly, Massachusetts, June 1, in the United States 

 National Museum. 



Type. — In Museum of Comparative Zoology, Cambridge, Massa- 

 chusetts. 



No. 59. DOLICHOPUS NODIPENNIS, new species. 



Male. — Length, 5.2 mm. ; of wing, 5 mm. Face of moderate width, 

 silvery white. Front dark green, shining. Antennae (fig. 59a) wholly 

 black; third joint large, nearly twice as long as wide, pointed at tip, 

 arista inserted a little beyond the middle, longer than the antennae. 



Thorax dark green, shining, sometimes with coppery reflections on 

 lateral edges and along the central line; pleurae more black, dulled 

 with gray pollen. Abdomen dark green with coppery reflections near 

 theJiind margins of the segments, incisures narrowly black. Hypo- 

 pygium black; its lamellae of moderate size, somewhat triangular in 

 outline, but rounded at tip, whitish or yellowish, the edge scarcely 

 darker, not jagged or bristly, fringed with delicate brown hairs. 



