DIPTERA. 145 
than the chest and full twice its length, tapering from the base to the tip 
which is compressed and shining ; hind borders of the segments adorned with 
hoary bands, armed on each side with a pair of white spines: legs bluck, 
clothed with short black hairs, armed with black and white spines ; thighs 
thinly clothed with hoary hairs; shanks tawny, with black tips ; feet covered 
beneath with tawny down; foot-cushions tawny: wings slightly gray; 
wing-ribs and veins black; poisers yellow. Length of the body 7 lines; 
of the wings 114 lines. 
Van Dieman’s Land. 
AsILus oBuMBRATUS, Fem. 
Niger, capite sublus albo, thorace vittis quinque fulvis ornato, pectore 
cano, abdomine nigro-fusco segmentorum marginibus posticis canis, 
antennis nigris, pedibus fulvis, femoribus piceis, alis subcinereis. 
Body black : head adorned with a yellowish brown covering, white 
and clothed with white hairs behind and beneath, beset behind the eyes 
with black bristles; a few black hairs on the crown; face yery slightly 
convex towards the epistoma, thickly beset with black bristles: eyes bright 
coppery; fore part nearly flat, its facets larger than those elsewhere : 
sucker clothed at the tip with tawny hairs; palpi clothed with black hairs : 
feelers black: first and second joints clothed with black hairs; second 
mich shorter than the first; third conical, a little longer than the first ; 
bristle rather stout, longer than the third joint: chest black, clothed with 
black hairs, beset on each side and behind with black bristles: adorned 
with five pale tawny stripes ; middle stripe very indistinct ; each side pair 
united in front and behind: breast hoary: abdomen dark brown, narrower 
than the chest and much more than twice its length, clothed with short 
black hairs, and towards the base with longer hoary hairs, nearly linear 
for more than half the length, very slightly tapering from thence to the 
lip, which is compressed and shining ; hind borders of the segments hoary ; 
hoary bands along the hind borders of the first and second segments : legs 
tawny, clothed with very short hoary hairs, armed with black spines; thighs 
pitchy ; claws black: wings very slightly tinged with gray; wing-ribs 
tawny; veins black, tawny at the base; poisers tawny. Length of the 
body 5 lines; of the wings 8 lines. 
New South Wales. 
