290 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



apical margin, which extends narrowly along the upper edge; jagged 

 and bristly at apex, fringed above witli a few bristle-like hairs. 



Coxae, femora, and tibiae yellow. Middle coxae more or less 

 blackened on outer surface; anterior surface of fore coxae covered 

 with white pollen and delicate yellow hairs, sometimes with a few 

 minute black hairs along the inner edge. Middle and hind femora 

 each with one preapical bristle, the latter without cilia, but with a 

 row of minute yellow hairs on lower inner edge. Middle tibiae 

 with three bristles below, two near apical and one near basal third, 

 their basitarsi with a large bristle near apical third. Posterior 

 tibiae a little thickened; the usual glabrous stripe on u})per surface 

 distinct, but a little broken by a few hairs; just inside of the inner row 

 of large bristles is another narrow glabrous stride extending their 

 whole length and uniting with the upper one at the tip of the tibiae. 

 Fore tarsi (fig. 213a) one and a fourth times as long as their tibiae, 

 yellow with the last two and a half joints black; first two joints 

 plain, second joint fully three-fourths as long as first; last three joints 

 scarcely at all compressed, taken together about as long as second; 

 third and fourth joints fringed above with long black hairs, fifth some- 

 what orbicular and fringed above with little black hairs. Middle tarsi 

 blackened from the tip of the first joint, still the second often yellow- 

 ish. Hind tarsi deep black from the tip of the first joint. Calypters 

 and halteres yellow, the former with black cilia. 



Wings (fig. 213) long, narrowed toward the root, grayish, more or 

 less tinged with yellowish brown; costa with a small knot-like enlarge- 

 ment at tip of first vein; last section of fourth vein bent beyond its 

 basal third, the posterior angle of this bend often bears a stump; 

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

 slight lobe at tip of sixth vein and another at the anal angle, with a 

 shallow sinus between them. 



Female. — Very like the male, except the face is wider, and there is 

 oidy a slight indication of the lobe at tip of sixth vein, the hind margin 

 l)eing more broadly rounded and the anal angle slightly cut oft' from 

 the tip of the sixth vein. 



Red escribed from many males and females from the following loca- 

 tions: Lafayette, Indiana, May 19-July 4; Merchantville, New Jersey, 

 (Johnson), June 28; Plummers Island, Maryland, July 28; Chain 

 Bridge, District of Columbia, June 15; East Falls Church, Virginia, 

 (Banks), August 3; Irving, New York, August 26; Ithaca, New York; 

 Montgomery County, Pennsylvania, July 4; Ohio; Coliunbia, Mis- 

 souri, June 1; Knoxville, Tennessee, May 21 (Summers); North 

 Carolina; Florida; Lawrence, Kansas, July; Waubamic, Ontario, 

 June 14 (Parish). 



Tyjye localities.— MiiVWd States and Washington, District of Co- 

 lumbia. Melander and Brues report it from Vancouver Island; 

 Johnson from Florida. 



