DIPTURA. 137 
Asitus Turerimacnus, Mas et Fem. 
Niger, thoracis vitlis tribus pectore ventreque cinereis abdominis segmen- 
torum marginibus posticis canis, antennis pedibusque nigris, alis sub- 
limpidis, apicibus marginibusque posticis cinereis. 
Male. Body black, with a very slight bluish tint, which appears most 
on the sides of the breast: head adorned in front with a tawny covering, 
whitish and clothed with white hairs behind and beneath, beset behind the 
eyes with a row of black bristles; crown clothed with a few black hairs ; 
face very convex towards the epistoma, thickly clothed with long, shining, 
white hairs ; a few black hairs towards the feelers and along the sides of 
the face and of the peristoma: eyes bronzed ; fore part flat, its facets much 
larger than those elsewhere: sucker dark tawny and clothed with pale 
tawny hairs at the tip ; palpi beset with long black hairs; feelers black ; 
first and second joints beset with long black bristles ; second not more 
than half the length of the first ; third long spindle-shaped, much longer 
than the first joint; bristle nearly as long as the third: chest adorned with 
three gray stripes, clothed with black hairs and bristles, the latter mostly 
on the hind part ; sides, hind-chest and breast tinged with gray: abdomen 
pitchy black, clothed with hoary hairs, very slightly tapering from the base 
to near the tip, a little narrower than the chest and less than twice its 
length ; hind borders of the segments beset with black bristles and adorned 
with hoary bands ; sides gray with a tawny tinge ; underside gray; sexual 
parts large, black, shining, beset with black bristles, which form a tuft 
on each side above, the part between adorned with silky white and pale 
yellow hairs: /egs black, clothed with short black hairs, armed with black 
bristles and spines; thighs thinly clothed with white hairs ; hind-shanks 
very slightly curved ; feet and tips of hind-shanks partly adorned with a 
tawny tinge beneath ; claws at the base and foot-cushions tawny: wings 
nearly colourless, gray along the fore border towards the tips, and along the 
hind border except at the base; wing-ribs dark ferruginous ; veins black, 
ferruginous at the base ; poisers pale yellow, tawny at the base. 
Fem. White hairs on the face much less numerous than those of the 
male ; black hairs more numerous: abdomen black, about twice the length 
of the chest, slightly tapering from the base to the tip, towards which it is 
shining ; hind borders of the segments hoary ; a hoary tinge on each side 
and beneath. 
Length of the body 6—6} lines; of the wings 12 lines. 
Brazil. 
ae 
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