DIPTERA. 141 



aud second joints beset witli long black bristles ; second a little shorter 

 than the first ; third long, spindle-shaped, rather slender, much longer than 

 the second ; bristle ratlier stout, nearly as long as the third joint: chest 

 and breast hoary ; chest beset with a few black hairs and bristles, its disk 

 black, adorned tvith three hoary stripes : abdomen very slightly tapering 

 from the base to the tip, nearly twice the length of the chest, clothed with 

 black and white bristles and hairs, the hitler most frequent on the under 

 side, tvhich is hoary, as are also the hind borders of the segments above ; tip 

 shining, beset beneath with black bristles : legs black, thinly clothed with 

 hoary hairs, armed with black spines ; hind-shanks and feet adorned be- 

 neath with tawny down ; foot-cushions tawny : tclngs pale gray, dark gray 

 toicards the tips and thence along the greater part of the hind border ; wing- 

 ribs and veins black ; poisers yellow. Length of the body 6i lines ; of tlie 

 wings 13 lines. A. Gamaxus, Fem. ? 



South America. 



AsiLus Maricus, Fem. 

 Niger, antennis pcdibusque nigris, tibiis fulvis apice nigris, alis cincreis. 



Body black : head mostly adorned with a dark tawny covering, 

 clothed behind and beneath with tawny hairs ; a few black hairs on the 

 crown ; face very convex towards the epistoma, beset with pale yellow 

 bristles and nearer the feelers with black bristles ; sides of the peristoma 

 also beset with black bristles : eyes black ; fore part nearly flat, its facets 

 larger than those elsewhere : sucker clothed at the tip with short pale 

 hairs : palpi clothed with pale yellow hairs : feelers black ; first and se- 

 cond joints of nearly equal length, beset with black bristles ; third as long 

 as the first and the second, very slightly tapering from the base to the tip ; 

 bristle much stouter than usual, tapering from the base to the tip, more 

 than half the length of the third joint: chest thinly clothed with tatvny 

 hairs : abdomen slightly compressed, clothed icith a fete hoary hairs, nar- 

 rower than the chest and much more than twice its length, very slightly 

 tapering from the base to the tip ivhich is shining and much compressed : 

 legs black, clothed with short bkck hairs, beset with black bristles ; thighs 

 with a tawny tinge ; shanks tawny, black for one-third of the length from 

 the tips ; claws at the base and foot-cushions tawny : ivings gray ; wing- 

 ribs and veins black ; foot-cushions tawny. Length of the body 9 lines ; 

 of the wings 1 4 lines. 



Port Philip. 



