C. II. TYLER TOWNSEND. 
8()2 
width. Eyes brown, bare (except several microscopic, extremely indistinct hairs 
on lowest portion); front about one-third width of head at vertex, widening 
before, prominent, fi’ontal bristles strong and thick, descending a little below 
base of antennpe, about to ba.se of third antennal joint ; one stout bristle at each 
vertical angle directed backward and slightly outward ; next frontal bristle much 
shorter, directed backward ; next stout, directed backward and slightly inward, 
rest directed inward, decussate to base of antennae, no orbital bristles ; two pairs 
of ocellar bristles, jiosterior pair shorter, nearly erect, pointed forward at ti]i, the 
forward pair long, curved strongly forward and a little outw’ard ; some fine hairs 
on front outside the frontal bristles; front, face and cheeks silvery white, the 
sides of front appearing bluish in some lights, frontal vitta yellowish brown, of 
equal width ; sides of face of moderate width, bare below frontal bristles ; cheeks 
one-third eye-hight in width, bare except a few hairs on lower posterior portion, 
with strong bristles on lower l>orders ; face oblique, receding, epistoma prominent^ 
facial ridges bare, vibrissse inserted a short distance above the oral margin, 
slightly decussate; antennae black, first joint short; second joint elongate, 
somewhat silvery; third joint widened, about one and one-half times as long as 
second; arista short, black, minutely pubescent, thickened more than half its 
length, distinctly 3-jointed, second joint elongate! i>roboscis black, long, rather 
slender, straight, more than twice as long as bight of head, corneous, labella but 
little developed; palpi light yellowish, slender, slightly thickened and darker 
at tip, black hairy; occiput convex, silvery, with grayish hair in centre, and a 
fringe of black bristles on orbital margins. Thorax and scutellum bluish black, 
silvery, more so on humeri and pleurae, with macro'chaetae and fine black hair ; 
scutellum with a subapical pair of macrochaetai, not decussate, reaching nearly 
as far as to base of third abdominal segment: a pair of decussate bristly hairs 
are situated between them and represent the apical, decussate macrocha;tae ; a 
lateral macrochseta near the forward border of scutellum. Abdomen very elon- 
gate-oval, vaulted, first joint shortened; color shining black, bases of second to 
fourth segments more or less widely silvery, sides of second segment broadly 
orange-red (except sometimes hind margin) extending on the segment in front 
and behind; abdomen covered with short, black, depressed bristles and stout 
macrocluetfe, tbe latter only marginal, except on last segment; first segment 
with one lateral macroclueta ; second with a single lateral one and a median 
pail-; third with eight above, and about as many weaker ones below; fourth 
segment with discal and marginal macrochsetfe interspersed with shorter, stiff 
bristles, producing quite a s]dny ajipearauce. Legs black, femora and tibice 
slightly silvery, quite bristly, especially the middle and hindtihise; claw-sand 
pulvilli elongate. Wings grayish hyaline, slightly yellowish at extreme base, 
just as long as alidomen, with a strong costal spine, third vein spined more than 
half its length; apical cell closed in the border, ending considerably before the 
tip of the wing; curvat\ire of fourth vein rounded, without stump or wrinkle; 
hind cross- vein oblique, not straight, about in the middle between the small 
cross-vein and bend of fourth vein ; stump of fifth vein strong, nearly reaching 
the margin; tegulse white, halteres light yellow-ish, 
9 . — A female which I refer to this species differs as follows ; Eyes more notice- 
ably, microscopically hairy on lower portion ; front wider; vibrissje more decus- 
sate ; two orbital bristles directed forward, and, particularly the front ones, out- 
ward ; frontal bristles less thick; third antennal joint no longer than second; 
bristles on lower border of cheeks much w-eaker; sides of first abdominal seg- 
ment broadly orange; claws and pulvilli short. Length 7 mm. ; of w-ing 5 mm. 
