DIPTERA. 151 
in front with some black spines beyond which it is thickly clothed with 
long pale yellow and whitish hairs: eyes bronzed ; fore part nearly flat, 
its facets larger than those elsewhere: sucker black, tawny at the tip, 
clothed with long pale yellow hairs; palpi tawny, thickly clothed with long 
pale yellow hairs and bristles, and with a few black bristles: first and 
second joints of the feelers red, beset with short black bristles ; second 
much shorter than the first: chest and breast ferruginous : chest beset with 
a few black hairs and bristles, adorned with four brown stripes, of which 
the middle pair are narrow, linear and entire, the side pair broader, shorter 
and interrupted ; breast tinged with gray, clothed with tawny hairs: abdo- 
men bright tawny, less than twice the length of the chest, clothed with 
tawny hairs, which are longest and most thick towards the base, pitchy 
and obeonical from the first to the third segment, narrower and linear from 
thence to the tip which is dark red, shining and thickly clothed with black 
hairs: legs dark red, clothed with short black hairs, armed with black 
spines: thighs clothed with hoary hairs; claws black; foot-cushions 
brownish tawny: wings tuwny ; wing-ribs ferruginous; veins pitchy, fer- 
ruginous towards the base and along the fore border; poisers tawny. 
Length of the body 13 lines; of the wings 20 lines. 
Rio Janeiro. 
Asitus Gavius, Fem. 
Niger, thoracis vittis tribus pectore ventreque canis, capite subtus abdomi- 
nisque segmentorum marginibus posticis albidis, antennis nigris ar- 
ticulo 30 basi fulvo, pedibus nigris, tibiis apice tarsisque subius fulvis, 
alis subcinereis ad costam fuscis. 
Body black ; head adorned with a tawny covering in front, whitish 
and clothed with white hairs behind and beneath, beset behind the eyes 
with black bristles; crown brown, beset with black hairs and with four 
black bristles ; face very prominent, beset with black bristles, and towards 
the epistoma with long bright yellow bristles, the latter are more cluster- 
ing than the former, and there are a few of them along the sides of the 
peristoma: eyes bronzed; fore part flat, facets of its disk larger than those 
elsewhere: sucker clothed at the tip with a few short pale tawny hairs; 
palpi beset with long black hairs: feelers black ; first and second joints 
beset with black bristles, second hardly more than half the length of the 
first; third tawny at the base, tapering from near the base to the tip, longer 
