THE DIPTEKOUS GENUS DOLICHOPUS IN NORTH AMERICA. 167 



nent. Cilia of calypters more or less blackish, usually the yellow 

 predominating. 



Redescribed from many males and females. The Aldrich collection 

 contains specimens from New Hampshire, taken by Mrs. Slosson; 

 Algonquin, Illinois, taken by Dr. W. A. Nason; Polk County, Wis- 

 consin, July, taken by Baker; and Lafayette, Indiana, taken June 

 4-18, 1915, by J. M. Aldrich. I have taken it at Buffalo, New York, 

 Jmie 12, 1910; Gowanda, New York, June 15, 1913; Portage, New 

 York, July 1, 1917; Ridgeway, Ontario, July 15, 1917; Fort Erie, 

 Ontario, July 4, 1910; Chatham, Ontario, June 17, 1915; Bond Lake, 

 Ontario, July 16, 1918. H. S. Parish took it at Waubamic, Ontario, 

 Jmie 14, 1915. A. L. Melander took it at Lynden, Vermont, June 13, 

 1914. In the United States National Museum are specimens taken 

 at the White Momitains, New Hampshire, by Morrison; at Bristol, 

 Rhode Island, June, 1878; and Beverly, Massachusetts, June. 



Tifpe localities. — ^Massachusetts and Connecticut, Aldrich reports 

 it from Michigan. Johnson, Insects of New Jersey, 1909, reports it 

 from Clementon, May 30; Anglesea, May 28; Burlington and Ocean 

 Counties, May. 



Type. — In University of Kansas. The females of alhicoxa, varia- 

 hilis, and socius differ as follows: Socius has no bristle on the middle 

 basitarsi, which is usually, if not always, fomid in the others, and the 

 posterior tibiae have sharply defined black tips; in variabilis these 

 tibiae are wholly yellow, while in albicoxa they are blackened a 

 little, especially on imier side, but the blackish color shades into the 

 yellow. In albicoxa the third and fourth veins of the wing are dis- 

 tinctly convergent, their tips being rather close together; in variabilis 

 the tips are widely separated, but the third vein bends back a little 

 at tip; while in socius the third and fourth veins are nearly parallel 

 at tip, the third being nearly straight. 



No. 116. DOLICHOPUS PILATUS, new species. 



2Iale. — Length 5.7 mm. ; of wing 5 mm. Face wide, grayish white. 

 Front greenish, or bronze-brown with green reflections. Antemiae 

 (fig. 116) black; first joint yellow below; third moderately large, 

 a little longer than wide, somewhat rounded at tip; arista, a little 

 longer than the antennae with an enlarged, somewhat spear-shaped 

 tip, which forms more than one- third of its length. Lateral and in- 

 ferior orbital cilia yellowish, about seven of the upper cilia on each 

 side black. 



Thorax greenish, or bronze-brown with green and coppery reflec- 

 tions; dorsum a little dulled with gray pollen; pleurae dulled with 

 white pollen. Abdomen green with coppery reflections; the white 

 pollen on its sides abundant and extending upon the dorsum. 

 Hypopygium black; its lamellae rather large, somewhat elliptical 



