ZOOL— Vol. II.] WHEELER— DOLICHOPODID^. 55 



small, almost entirely concealed, only the tips of the minute yellow append- 

 ages projecting. Pleurae and coxae dark bronze green, thickly covered with 

 gray dust. Fore coxae with yellow tips and with some distinct yellow hairs 

 on their anterior surfaces. Legs yellow, more or less infuscated on the upper 

 surfaces and tips of the femora and the tips of the tibiae. Tarsi infuscated 

 from the tip of the first joint. Fore tibiae not incrassated, bearing a single 

 conspicuous bristle on the outer surface near the middle; first joint of fore 

 tarsi very short, second joint slender, as long as the third and fourth together; 

 third and fourth subequal, with a few long hairs on their upper surfaces near 

 their tips; fifth joint rather slender, a little more than twice as long as the 

 first joint. First joint of middle tarsi slender, longer than all the remaining 

 joints together; second a little longer than the third and fourth together, 

 slightly widened at the tip and produced into a point provided with a few 

 long hairs; third and fourth joints short, subequal, slightly flattened, oval; 

 fifth joint slender, nearly as long as the third and fourth joints together. 

 Hind tarsi shorter than the tibiae; first joint distinctly shorter and a little 

 thicker than the second joint. Wings gray, with prominent anal angle; third 

 and fourth veins nearly parallel, the latter ending exactly in the tip of the 

 wing; posterior cross-vein about two and one-half times its own length from 

 the posterior margin, measured along the distal segment of the fifth vein. 

 Sixth vein absent. Halteres and tegulae yellow, the latter edged with black 

 and bearing a flabelliform cluster of unusually long yellowish brown cilia. 



One specimen from Lewiston, Idaho, received from 

 Professor J. M. Aldrich. 



This species resembles Loew's N. frontalis. Loew's 

 species, however, has the basal segments of the abdomen 

 largely yellow, the scutellum concolorous with the thorax, 

 a larger hypopygium, the posterior margin of the pleurse 

 and all the coxae yellowish, and the third joint of the fore 

 tarsi of the male considerably shorter than the fourth. The 

 middle tarsi are similar in the two species. 



54. Nothosympycnus Oreas, sp. nov. 



Plate III, Figs. 86 and 87. 



Male. Length 3 mm.; length of wing 2.75 mm. Proboscis and palpi 

 brown. Face very narrow, especially near the middle, where the eyes 

 almost meet, covered with gray dust. Antennae long, dark brown, first joint 

 cylindrical, rather long, with a blunt ventral projection at the tip; third joint 

 large, oval, evenly rounded, pilose; arista inserted near the base on the dor- 

 sal side, very long, tapering to a point, somewhat flattened owing to a 

 delicate pubescence along its two opposite edges; this pubescence is scarcely 

 perceptible on the basal segment of the arista, but long and distinct before 

 the tip. Front metallic green, more golden along the orbits. Postocular 

 cilia distinct, black above, snow-white below. Thorax and scutellum metallic 

 green, thickly overlaid with yellow dust especially in front. This dust is. 



