218 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



joint yellow on inner side, black on outer; third wholly hlack, about 

 as long as wide, rounded at tip. Lateral and inferior orbital cilia 

 yellowish, about four of the upper cilia on each side black. 



Thorax green; dorsum dulled with gray pollen and with more or 

 less coppery reflections, which forms somewhat of a median vitta; on 

 each side at the suture is a bronze brown spot; pleurae dulled with 

 white pollen. Abdomen green with coppery reflections, especially 

 toward its tip; the white pollen on its sides abundant. Hypopygium 

 black; its lamellae large, somewhat elliptical, but narrowed into the 

 stem, about two and a half times as long as wide, being as long as the 

 second joint of the hind tarsi, yellowish with rather wide black border 

 on apical, and narrow border on upper margin, jagged and bristly 

 at apex, closely fringed above with little black hairs. 



Fore coxae wholly yellow, their anterior surface covered with little 

 yellow hairs, usuaUy with a few minute black ones on inner edge; 

 middle and hind coxae black with yellow tips, the latter yellow on inner 

 surface. Femora and tibiae yellow; middle and hind femora each with 

 one preapical bristle, the latter without cilia below, but with a row of 

 delicate little yellow hairs on the lower inner edge, on the outer surface 

 the little black hairs descend nearly or quite to the lower edge. Pos- 

 terior tibiae moderately thickened; the usual glabrous stripe on upper 

 surface is broken up by the irregular placing of the large bristles and 

 numerous little black hairs; fore tarsi (fig. 157) nearly one and a half 

 times as long as their tibiae; the two first joints slender, thin, glabrous 

 on the sides, with minute black hairs on upper and lower edges, taken 

 together nearly as long as the tibia; second two-thirds as long as first, 

 third short, about one-third as long as second; first three joints yellow, 

 third sometimes with the tip black, the black more extensive on outer 

 surface, which is sometimes mostly infuscated; it is slightly widened 

 at tip; fourth joint black, about as wide as long, closely fringed above 

 with black hairs; fifth joint black, compressed, about as long as third 

 and fourth together, somewhat oval, but narrowed toward the base, 

 fringed above with black hairs; last three joints taken together about 

 as long as first, forming a somewhat elongate triangular tip to the 

 tarsi, but broadly rounded at tip. Middle tarsi about one and a 

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

 joint, which has a large bristle above. Hind tarsi black, sometimes a 

 little yellowish at base. Calypters and halteres yellow, the former 

 with black cilia. 



Wings grayish, tinged with j^ellowish in front; costa scarcely 

 enlarged at tip of first vein; last section of fourth vein a little bent 

 beyond its basal third; hind margin of wing only a little indented at 

 tip of fifth vein, with a sinus between the tips of fifth and sixth veins, 

 so as to form a slight lobe at tip of sixth vein, from which point the 



