84 BULLETIN llfi, UNITED STATES NATIONAL MUSEUM. 



tapering to its tip; last section of fourth vein a little bent just beyond 

 its basal third; third and fourth veins approach each other a little 

 from the bend, still their tips rather far apart; hmd margin of wing 

 scarcely indented at tip of fifth vein; evenly rounded, the anal angle 

 not being prominent. 



Described from 1 male taken by Prof. A. S. Packard at Strawberry 

 Harbor, Labrador. 



Type.— Ill the Museum of Comparative Zoology in Cambridge, 

 Massachusetts. 



No. 44. DOLICHOPUS XANTHOCNEMUS Loew. 



DolichopiLS xanihocnemus Loew, Mon. N. Amer. Dipt., pt. 2, 1864, p. 31. — 

 CoQuiLLETT, Proc. Wash. Acad. Sci., vol. 2, 1900, p. 424. 



Male. — Length 4 mm. ; of wing 3.75 mm. Face of moderate width, 

 silvery white. Front bluish green or bronze green. Antennae 

 (fig. 44a) wholly black; third joint nearly round in outline, a little 

 pointed at tip; lateral and inferior orbital cilia whitish, a few of the 

 upper cilia black. 



Thorax green, not very shining, with slight bronze reflections, 

 which sometimes take the form of vittae; pleurae a little dulled with 

 gray pollen. Abdomen green with black incisures, covered with 

 white pollen which is thickest on its sides and leaves a blackish stripe 

 on the center of the dorsum in certain lights. Hypopygium black; 

 its lamellae rather small, somewhat oval in outline, whitish with a 

 black border at apex; jagged and bristly on apical margin. 



Coxae black with their extreme tips and the trochanters yellowish. 

 Femora black with yellow tips; the yellow on middle pair often shades 

 into the black, making them more than half yellowish; hind pair 

 sometimes yellowish below. Middle and hind femora each with one 

 preapical bristle, the latter ciliate below with very delicate pale 

 hairs, which are rather scattering and about as long as the width of 

 the femora; the fore and middle femora have minute pale hairs 

 below, which may be easily overlooked. Tibiae yellow; posterior 

 pair black at tip for nearly one-third their length, the black part a 

 little more thickened than the rest. Fore and middle tarsi a little 

 longer than their tibiae, blackened from the tip of the first joint; fore 

 tarsi with the third and fifth joints of equal length, the fourth being 

 a little shorter. Hind tarsi wholly black. Calypters and halteres 

 yellow, the former with black cilia. 



Wings (fig. 44) grayish; costa with a very small knot-like enlarge- 

 ment at tip of first vein; last section of fourth vein moderately 

 bent before its middle; hind margin of wing not indented at tip of 

 fifth veiii; anal angle quite prominent, making the wing of somewhat 

 equal width from tip of second vein to the anal angle. 



