194 15ULLETIK 116, u:n^ited states national museum. 



three-fourths times as long as the tibiae; in the first two they are 

 black from the tip of the first joint, while in the last two they are 

 yellow, except the last one or two joints. The species greenei differs 

 from luteipennis in having the cilia of the hind femora shorter than 

 the width of the femora, while in the latter it is longer, or at least as 

 long, as the width of the femora; in luteipennis the thhd vein of the 

 wing is distinctly bent backward at tip so as to approach the fourth 

 a little, while in greenei the third vein is nearly straight and parallel 

 A\dth the fourth; the fourth and part of fifth joint of fore tarsi are 

 black in greenei, but only the fifth is black in the other; the cilia of 

 the calypteres is black in the former, yellow in the latter. 



No. 137. DOLICHOPUS WHEELERI Melander and Brues. 



Hygroceleuthus w^eeZen Melander and Brues, Biol. Bull., vol. 1, 1900, p. 126, figs. 



Male. — Length 4.5 mm.; of wing 4 mm. Face long and narrow, 

 silvery white. Front violet, more bluish along the orbits. Antennae 

 yellow; third joint black, longer than wide, somewhat oval in out- 

 line, obtusely pointed at tip. Lower orbital cilia whitish, the black 

 cilia descending nearly to the middle of the eye height. 



Thorax green, scutellum blue in the center; anterior slope of the 

 dorsum covered with white pollen; pleurae with gray pollen. Abdo- 

 men green with black incism'es and coppery and bronze reflections 

 on the hind margins of the segments; the white pollen on its sides 

 extending upon the dorsum. Hypopygium black; its lamellae rather 

 large, oval, whitish, apparently without a black border, a little jagged 

 and bristly at apex. 



Fore coxae yellow with minute black hairs on the anterior surface- 

 Middle and hind coxae yellow with the outer surface largely black. 

 Femora and tibiae yellow. Middle and hind femora each with one 

 preapical bristle, the latter nearly bare below. Posterior tibiae a 

 little thickened; the glabrous stripe on upper surface distinct and 

 reaches their whole length. Middle tibiae slender, nearly twdce as 

 ong as their femora, glabrous on their upper surface. Fore tarsi 

 one and a fourth times as long as their tibiae, black from the tip of 

 the first joint, middle tarsi (fig. 137&) deep black, scarcely as long as 

 the fore tibiae, their basitarsi fringed ^\^th long, deep black hairs, so 

 as to give them an oval appearance, about half as wide as long, to 

 the outside of the hairs, three-fourths as long as the remaining four 

 joints taken together. Hind tarsi wholly black, scarcely at all yel- 

 low at base. Calypters and halteres yellow, the former with black 

 cilia. 



Wings (fig. 137) grayish, slightly tinged with yellowish brown in 

 front of third vein; costa not enlarged at tip of fifth vein; last sec- 

 tion of fourth vein a little bent before its middle and \A-ith a slight 

 cloud at the bend; hind margin of wing not indented at tip of fifth 



