DIPTERA. 149 
base; poisers tawny. Length of the body 5} lines; of the wings 11 
lines. 
Columbia. 
Asizus Crrsicies, Mas. 
Niger aureo tectus, thorace nigro quadrivittato, pectore et metathorace 
canis, abdomine cervino, antennis nigris, pedibus fulvis, femoribus et 
tibiis apice tarsisque nigris, alis subfulvis apice fuscis. 
Body black : head adorned with a tawny covering, paler behind and 
beneath where it is clothed with whitish hairs; a few black bristles on each 
side of the crown; hind part clothed with pale yellow hairs, beset with 
very few black bristles; face very convex towards the epistoma and 
beset with a few black and with more long pale yellow bristles; a few 
pale yellow hairs on each side of the peristoma; eyes bronzed; fore 
part flat, its facets much larger than those elsewhere: sucker black, 
clothed at the tip with short pale tawny hairs; palpi black, clothed with 
many long black hairs: feelers black; first and second joints beset with 
very few black bristles, second about half the length of the first; third 
tapering from the base to the tip, a little shorter than the first: bristle 
slightly widened at the tip, more than twice the length of the third joint : 
chest adorned with a golden covering, beset with a few black bristles, having 
four black stripes, of which the middle pair are narrow and straight, the 
outer pair are broader, spindle-shaped and interrupted by two oblique bands ; 
breast and hind part of the chest hoary: abdomen fawn colour, tapering 
from the base to near the tip, narrower than the chest and less than twice 
its length, thinly clothed with pale hairs; sexual parts large, black, shin- 
ing: legs bright tawny, thinly clothed with very short black hairs, armed 
with black spines; feet and tips of the thighs and of the shanks black ; 
foot-cushions bright tawny: wings with a slight tawny tinge, brown towards 
the tips ; wing-ribs and yeins black; poisers tawny with pitchy knobs. 
Length of the body 7 lines; of the wings 12 lines. 
South America. 
