86 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



middle; hind margin of wing scarcely indented at tip of fifth vein; 

 anal angle not prominent. 



Female. — Face wide, silvery white; hind tibiae yellow with black 

 tips, the black being poorly defined, but extending as a streak up 

 inner surface; middle and hind femora fringed on lower edge with 

 delicate little hairs, which could scarcely be called cilia; costa with- 

 out an enlargement at tip of first vein; bend in last section of fourth 

 vein distinctly before its middle. Otherwise about as in the male. 

 Middle tibiae with one bristle below, their basitarsi without a bristle 

 above. 



Redescribed from several males and females taken in the following 

 localities: Illinois, July and Aug.; Mount Washington, New Hamp- 

 shire; Shelby, Indiana, May 24; Sandusky, Ohio, August 20; Olcott, 

 New York, July 10; Lancaster, New York, May 5; East Aurora, 

 New York, June 9; Toronto, Ontario, July 15. 



Tyye locality. — Illinois. Osten Sacken reports it from western 

 New York, Wheeler from Wiscons'in, Aldrich from Michigan and 

 New Jersey, Chagnon from Montreal, Canada, Mrs. Slosson from 

 New Hampshire. 



No. 46. DOLICHOPUS ALACER, new species. 



ifaZe.^Length 3.25-3.75 mm."; of wing 3-3.75 mm. Face rather 

 narrow, silvery white, narrowest in the middle. Front shining green. 

 Antennae wholly black; third joint scarcely as long as wide, rounded 

 at tip. Proboscis and palpi brownish yellow. Orbital ciha wholly 

 black. 



Thorax bright shining green, sometimes ■v^ith blue or coppery re- 

 flection; pleurae and coxae with white pollen. Abdomen green with 

 black incisures and abundant white pollen, which is thickest on its 

 sides. Hypopygium black; its lamellae (fig. 46a) of moderate size, 

 somewhat triangular in outline, rather truncate at outer end, white 

 with narrow black border on apical margin, which extends a short 

 distance on lower edge, ending abruptly and expanding on upper 

 corner so as to make the upper angle all black, a little jagged and 

 bristly on apical margin. 



Coxae black with yellow tips. Fore coxae with minute black 

 hairs on the anterior surface and the usual bristles at tip. Femora 

 black, often metallic green, their tips yellow. IVIiddle and hind 

 femora each with one preapical bristle, the latter' ciliate on lower 

 inner edge with sparse, delicate, whitish hairs for most of their 

 length, the longest of these hairs about two-thirds as long as the 

 width of the femora. Tibiae yellow; posterior pair with black at 

 tip for one-fifth their length, scarcely thickened, the glabrous stripe 

 between the rows of large bristles narrow but distinct; there are about 

 four bristles in each of the rows. Fore tarsi a little longer than 



