962 NEW YORK STATE MUSEUM 
Male. Black. Eyes contiguous, upper facets larger than the 
lower; antennae 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. Wings 
. 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 reddish 
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 brownish 
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 
