LIST OF D1PTERA. 327 



the base to the tip, a little narrower than the chest and more than 

 twice its length ; hind borders of the segments and tip ferruginous, 

 the latter shining and clothed with tawny hairs ; first segment very 

 short ; second segment short ; third segment long, with a cross fur- 

 row near its base ; following segments successively decreasing in 

 length : legs ferruginous, thinly clothed with very short black hairs 

 and beset with some black spines ; feet black towards the tips ; 

 claws black ; foot-cushions tawny ; tip of each fore shank armed 

 with a curved black toolh, which corresponds with some black tuber- 

 cles at the base of each fore foot : wings tawny, light gray at the 

 tips ; wing-ribs ferruginous ; veins black ; poisers piceous. Length 

 of the body 13 lines ; of the wings 20 lines. 



Dasypogon Potitus, n. s. Fulvus, thoracis vittis tribus piceis ferru- 

 gineo marginatis, abdomine ferrugineo, segmentis piceo maculatis 

 albidoque fasciatis, antennis fulvis apice ferrugineis, pedibus 

 alisque fulvis. 



Body dull : head tawny, as broad as the chest, covered with 

 thick shining pale down, which appears yellow or tawny according 

 to the light in which it is seen ; crown beset with tawny bristles : a 

 fringe of pale yellow bristles along the borders of the eyes ; tubercle 

 1 of the eyelets armed with black bristles : clypeus furnished with nu- 

 \ merous long white bristles : eyes bluish black, divided as usual into 

 two parts which are distinctly marked : lip black, furnished at the 

 tip with a cluster of yellow hairs ; the other parts of the mouth fer- 

 ruginous ; palpi rather long, clothed with long yellow hairs : feelers 

 tawny ; first joint beset with yellow hairs and with a very few short 

 black hairs ; second joint longer than the first, beset with short black 

 hairs and longer black bristles ; third joint ferruginous, very long 

 , spindle-shaped, as long as the first and the second, beset with a very 

 ; few short black hairs : chest and breast tawny : chest covered with 

 , short black hairs, and adorned with three broad ferruginous stripes, 

 i each enclosing a piceous stripe ; the middle piceous stripe divided 

 I by a ferruginous line ; sides of the chest beset with black bristles : 

 i breast rather paler than the chest, thinly clothed with yellow hairs : 

 abdomen ferruginous, decreasing in breadth from the base to the 

 i tip, narrower than the chest and about twice its length, clothed with 

 ! very short yellow hairs, and with longer yellow hairs at the 

 t tip which is shining; a large piceous spot on each side of every 

 segment blends imperceptibly with the ferruginous hue ; a whitish 

 i band occupies the hind border of every segment, and is widened on 

 i each side into a triangular spot ; first segment extremely short ; se- 

 cond segment short, with a cluster of yellow bristles on each side ; 



PART II. 2 G 



