DIPTERA. 149 



base ; poisers tawny. Length of the body 5^ lines ; of the wings 1 1 

 lines. 



Columbia. 



AsiLus Ctesicles, Mas. 



Niger aureo tectus, thorace nigro quadnvitlato, pectore et metathorace 

 cams, abdomine cervino, antennis nigris, jwdibus fulvis, feinoribus et 

 tibiis apice tarsisqtie nigris, alis subfuhis apice fuscis. 



Bodi/ 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 cpistoma 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 

 veiy 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 

 Jour 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 tatvny, 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 ivitha slight tawny tinge, brown towards 

 the tips; wing-ribs and veins black; poisers tawny with pitchy knobs. 

 Length of the body 7 lines ; of the wings 12 lines. 



South America. 



