C. H. TYLKR TOWNSEND. 
o.“)G 
(?) orbital l)ristles, tbe posterior one directed backward, the three others forward 
(in tbe only under observation there are three orbital bristles on one side and 
the forward one is directed backward like the posterior one, while on the other 
side there are four orbital bri.stles and only the posterior one is directed back- 
ward); the usual two pairs of ocellar bristles, front pair directed strongly for- 
ward and somewhat outward, the shorter hind pair directed a little outward ; 
cheeks wide, invaded under the eyes by the occijiital area, otherwise bare, with 
bristles on lower and forward borders; vibrissfe decussate, inserted well above 
the oral margin at a coirstriction of the facial ridges, which are bristly fora short 
distance above them; face hardly straight, a little oblique, epistoma hardly 
promineut ; antenme a little more than one-half length of face, flavous, first joint 
extremely short; second of moderate length, well clothed with short, black bris- 
tles, and with a long straight bristle on front border; third joint about twice 
the length of second, not widened, light flavous; arista black or dark brown, 
bare save for a microscopic pubescence, thickened about half its length, distinctly 
8-jointed, the second joint a little elongate; proboscis black, about as long as 
bight of head, not thick, labella considerably developed ; palpi flavous, rather 
loTig, slender, thickened at tip, with several fine, black bristles on under surface; 
occiput cinereous, silvery-bordered, black-hairy, with fringe of black hairs on 
orbital margins. Thorax and scutellum cinereous with a sort of brassy tinge, 
hairy, with but few bristles on thorax mostly behind ; a median pair of narrow, 
more or less indistinct, sometimes sub-obsolete dark vittge on thorax ; scutellum 
with an apical pair of macrochsetfe, which are decussate or barely so, and reach 
nearly to middle of second abdominal segment, and two lateral macrochsetse on 
each side; humeri and pleurae cinereous. Abdomen rather short, conical, clothed 
with appressed black bristles; first segment hardly shortened, blackish, reddish 
below and on the side.s, sometimes above on the hind margin except in middle; 
second segment all reddish or orange, covered with a silvery sheen, except a me- 
dian black vitta very narrow in front and much widened behind ; third segment 
reddish in front, silvery, broadly blackish behind, the posterior widened portion 
of the median vitta more distinctly shining black ; anal segment broadly silvery 
in front, the median posterior portion blackish ; the silvery pollen of the segments 
has much of a golden tinge in some lights, especially on the anal segment; venter 
mostly orange, blackish at anus ; first and second segments without macrochsetie ; 
third .segment with about eight rather weak, marginal macrochffitje, the outer 
ones only a little stouter than the bristles of tbe abdomen; anal segment with 
about six similar, marginal macrochsetse. Legs black, femora more or less silvery 
cinereous, femora and tibife bristly; claws and pulvilli elongate. Wings grayish 
hyaline, without costal spine, third vein with a small bristle at base ; apical cell 
oi)en, terminating considerably before tip of wing, fourth vein bent at an angle, 
with a wrinkle ajipearing like a stump; hind cross-vein a little curved, well ap- 
proximated to the bend of the fourth ; tegulse nearly white, halteres somewhat 
fuscous. 
9- — Differs in having the claws and pulvilli short. The front is nearly the 
same width, or slightly narrower. Length 6 — 6.5 mm. ; of wing 4.5 — 5 mm. 
Described from two specimens from Mr. Charles Robertson, col- 
lected near Carlinville, 111., which I am confident are S and 9 t)f 
the same sjiecies, although both of them have the facets of the eye 
