362 NEW YORK STATE MUSEUM 



Male. Black. Eyes contiguous, upper facets larger tlian tlie 

 lower; auteuuae brownish black, including the two rather elon- 

 gate basal joints, sparsely covered with short grayish white 

 pile; palpi black, hairy, four jointed, the second joint rather, 

 wide and flattened. Thorax black, unstriped, the dorsum sparsely 

 covered with an appressed, golden yellow pile, mixed with 

 some black hairs; the scutellum black, with a tuft of long, nearly 

 erect yellow hairs on each side; metanotum black, nearly bare; 

 pleurae brownish black, bare and subshining. 



Abdomen black, the basal half of each segment velvet-black, 

 the apical half of each segment (sometimes only the margin) 

 subshining, brownish black, everywhere thinly covered with an. 

 appressed pile of yellowish brown and black hairs, the yellow 

 hairs visible only in certain lights, so that both thorax and 

 abdomen appear black. On each side on the leaflike posterior 

 margin of the first abdominal segment is a fringe of long, dark 

 brown hairs. Legs brown to brownish black, including the 

 coxae; the tarsi are usually slightly darker; anterior tibiae with 

 one spur, middle and hind tibiae each with a pair; the legs, par- 

 ticularly the posterior ones, densely covered with pale brown or 

 yellowish hairs, posterior metatarsi as long as the following 

 four joints taken together, wider than the tibia, flattened later- 

 ally; all tarsal claws tridentate. Halteres entirely black. AYings 

 brownish yellow tinged, and usually both branches of media, 

 and the first and second anal veins brown clouded. This is most 

 apparent in a balsam-mounted wing. The radius is three 

 branched [see figure]. Length of dried specimens 3.5 to 4.5mm. 



Female. Black, everywhere thickly covered with golden yel- 

 low, appressed pile, so that the fly appears somewhat yellowish. 

 Eyes separated, the front black with appressed yellow pile; 

 antennae brownish black, the first two joints paler, sparsely 

 covered with short, appressed pale yellow pile, and a few scat- 

 tered black hairs; palpi dark brown, the mouth parts reddisli 

 brown with black tips. Dorsum of thorax black, unstriped, 

 thickly covered with golden yellow, appressed pile; scutellum 

 black, with a tuft of long, nearly erect yellow hairs at the sides, 

 metanotum subshining, brownish black, bare; pleurae brownisli 

 black, bare, and subshining. Abdomen black, when viewed from 

 behind the posterior margins of the segments often appear yel- 

 lowish white; wholly covered with yellow appressed pile. On the 

 sides of the leaflike, posterior margin of the first abdominal 

 segment is a fringe of long yellow hairs. The coxae are black;, 

 legs yellow, the knees, the tips of the tibiae and all the tarsal 

 joints slightly darker, the anterior tarsi specially, sometimes 

 brown: hind metatarsi elongate and flattened, though not so 



