THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 193 



and bristly on lower corner, otherwise fringed with delicate brown 

 hairs on upper and apical margins. 



Coxae yellow, middle pair a little darkened on outer surface; 

 anterior pair with minute yellow hairs on the front surface. Femora 

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

 bristle, the latter ciliated on lower inner edge of apical half with 

 rather stout yellow hairs, which are of nearly equal length and only 

 two-thirds as long as the width ot the femora; the cilia begin about 

 the middle of the femora but do not reach the tip, otherwise the hind 

 femora are nearly glabrous on their lower half, having only some very 

 minute yellow hairs. Posterior tibiae a little thickened; inner sur- 

 face glabrous on basal half, the glabrous portion gradually narrow- 

 ing to form a line just inside of the inner row of large bristles which 

 reaches the tip. Fore tarsi one and three fourths times as long as 

 their tibiae, plain, slender, first three joints yellow, each a little 

 shorter than the joint preceding it, the first two together fully as 

 long as the tibia, fourth joint black, about half as long as the third, 

 fifth a little shorter than the fourth, black at base, yellowish at tip. 

 Middle tarsi one and a fourth times as long as their tibiae, infuscated 

 from the tip of the first jomt, still the base of second and third joints 

 paler; middle basitarsi with a small bristle at apical third on upper 

 edge. Hind tarsi black from the tip of the first joint, which has two 

 large bristles on upper surface. Calypteres and halteres yellow, the 

 former with black cilia. 



Wings (fig. 136) grayish; costa without an enlargement at tip of 

 first vein, somewhat yellowish on inner edge; last section of fourth 

 vein bent near basal third, parallel with third from this point to its 

 tip, the third vein not being bent backward at tip; hind margin 

 of wing scarcely indented at tip of fifth vein; anal angle rather 

 prominent but rounded. 



Described from 1 male, which was taken at Chain Bridge, Virginia, 

 June 27, by C. T. Greene, for whom the species is named, 

 r Type.— Mole, Cat. No. 23035, U.S.N.M. 



The four species, variaiilis Loew, gracilis Akh'ich, luteipennis Loew 

 and greenei, new species, are about the same size; antennae yellow 

 and formed almost alike ; have the hind femora ciliated with yellow 

 hairs; the middle tibiae in all have three bristles below, two not far 

 from apical third and one near basal third; middle basitarsi with a 

 rather small but distinct bristle above ; and the fore coxae in all have 

 yellow hairs on the front siKface. 



The first two are alike, except that variabilis has yellow cilia on 

 the calypteres, smd gracilis black cilia; they differ from the other two 

 in having the fore tarsi shorter, about one and a fourth times as long 

 as the tibiae, while in the last two the fore tarsi are about one and 



