LIST OF DIPTERA. 433 



of black bristles, more thickly clothed beneath with whitish hairs ; 

 front beset with some black hairs on each side; clypeus very promi- 

 nent, armed with a few long black and yellow bristles : eyes very 

 dark bronze ; fore part flat, its facets larger than those of the other 

 part : lip black, clothed at the tip with short tawny hairs ; palpi 

 black, clothed with long black hairs ; feelers black : first and second 

 joints beset with a few short black bristles ; second joint not half 

 the length of the first ; third joint slightly tapering from the base 

 to the tip, hardly longer than the first ; bristle very much longer 

 than the third joint: chest and breast dark ferruginous, thinly 

 clothed with short black hairs : chest beset on each side and behind 

 with some black bristles, adorned with four black stripes ; side 

 stripes short, broad, each interrupted by an oblique tawny band : 

 abdomen piceous, narrower than the chest, and about twice its 

 length, tapering from the base to the tip, clothed with short tawny 

 hairs, and at the base with some longer and paler hairs, hoary on 

 each side and beneath ; hind borders of the segments ferruginous ; 

 first and second segments short ; second segment arched ; third and 

 following segments long, successively decreasing in length to the 

 tip, which is compressed, black and shining: legs black, clothed 

 with short tawny hairs, armed with black spines ; shanks red ; feet 

 red at the base ; foot-cushions tawny : wings brown ; wing-ribs 

 piceous ; veins black ; poisers tawny. Length of the body 9 lines 

 of the wings 14 lines. 



Asilus Gerion, n. s., fern. Ferrugineus, thoracis vittis quatuor pi- 

 ceis, abdomine nigro, apice compresso, pedibus nigris, tibiis 

 fulvis, alls fuscis. 



Body piceous : head nearly as broad as the chest, covered with 

 dark tawny down, clothed behind and beneath with hoary hairs, be- 

 set behind the eyes with a row of black bristles ; crown beset with 

 black hairs on each side; clypeus very prominent, thickly armed 

 with black hairs and bristles : eyes bronze ; fore part nearly flat, 

 composed of large facets : lip black, clothed at the tip with short 

 pale yellow hairs ; palpi black, clothed with long black hairs : fore- 

 chest short, beset with some black bristles : chest and breast dark 

 ferruginous, thinly clothed with short black hairs: chest beset 

 on each side and behind with a row of black bristles, adorned with 

 piceous stripes ; each of the side pair interrupted by an oblique band; 

 abdomen black, narrower than the chest, and more than twice its 

 length, tapering from the base to the tip, clothed with short black 

 hairs, and towards the base with long hoary hairs ; first and second 

 segments very short ; third and following segments long, successively 



