124 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



tibiae (fig. 70) with a row of four long bristles on iipjier surface the 

 longest of which is nearly three-fourths as long as the tibiae. Fore 

 tarsi about one and a half times as long as their tibiae; first joint 

 pale yellow, brown at extreme tip, slightly longer than the remaining 

 four joints taken together, last four jomts deep black, a little com- 

 pressed, second and third of nearly equal length, fourth about as 

 wide as long, fifth about as long as fourth but not as wide. Middle 

 tarsi nearly one and three-fourths as long as their tibiae, black from 

 the tip of the first joint, which has a row of eight or ten long, slender 

 bristles on up]:)er posterior edge, these are of decreasing length, the 

 first being about half as long as the joint. Hind tarsi wholly black. 

 Calypters and halteres yellow, the former with black cilia. 



Wings (fig. 70a) grayish; costa not enlarged at tip of first vein; 

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

 of wing scarcely indented at tip of fifth vein; nearly evenly rounded, 

 the anal angle being rounded off. 



Female. — Face wide, white; third antennal joint small, not longer 

 than wide; front without white pollen; lower orbital cilia not at all 

 flattened, not as white as in the male; palpi yellow; Fore coxae 

 with the little black hairs extending over most of their anterior 

 surface; middle tibiae with the bristles normal, their basitarsi 

 without any bristle above; middle and hind tarsi one and a fourth 

 times as long as their tibiae, blackened from the tip of the first joint, 

 the former with the basitarsi about as long as the remaining four 

 joints taken together, fifth joint slightly longer than fourth; bend 

 in the last section of fourth vein slightly nearer the cross-vein than 

 in the male. 



Redescribed from numerous males and females from the following 

 localities: Montgomery County, Pennsylvania, May 20 to July 24; 

 Washington, District of Columbia, May 5 ; New Bedford and Woods 

 Hole, Massachusetts; Lafayette, Indiana, May 4 to October 1; 

 Michigan City, Indiana, August 18; Shelby, Indiana, May 24; 

 0]5elousas, Louisiana, March; New Jersey, several places. May to 

 July; Western New York, May 26 to November 12; Cranmoor, 

 Wisconsin, June 21; Fort Erie, Ontario, Ma}^ 30; Black Creek, 

 Ontario, July 24; Toronto, Ontario, July and August; Kearney, 

 Ontario, July 26. College Station, Texas, March 16, 1008. 



Type localities. — Pennsylvania, Maryland, District of Columbia. 

 Aldrich reports it from Pennsylvania and New Jersey. Melander 

 and Brues from Massachusetts, Illinois, and Wisconsin. 



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

 chusetts. 



