402 LIST OF DIPTERA. 



convex, 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 covered with 

 a gray bloom and clothed with black hairs ; second joint about half 

 the length of the first ; third joint of the feelers tapering from the 

 base to the tip, about three-fourths of the length of the first; bristle 

 much longer than all the preceding joints : chest and breast covered 

 with ferruginous down ; chest thinly clothed with short black hairs, 

 beset on each side and behind with black bristles, adorned with four 

 black stripes, of which the middle pair are long and straight, the 

 side pair are shorter, broader, slightly curved, and each interrupted 

 by an oblique band : abdomen black, narrower than the chest, and 

 more than twice its length, tapering from the base to two-thirds of 

 its length, compressed, linear, and like a tail from thence to its tip, 

 very thinly clothed with tawny hairs, and also towards the tip with 

 black hairs ; sides and hind borders of the segments dark tawny ; 

 compressed segments black, shining, hairless : legs black, clothed 

 with black hairs, beset with black spines ; shanks bright tawny, 

 clothed with tawny hairs, their tips black ; claws black ; foot- 

 cushions tawny : wings tawny ; wing-ribs and veins piceous ; poi- 

 sers pale ferruginous. Length of the body 12 lines; of the wings 

 17 lines. 



a. Brazil. From Mrs. Momay's collection. 



b. ? 



Asilus Leon, n. s., mas. Cinereus, thorace flavo vittis quatuor 

 nigris, pectore albo, abdominis fasciis canis, antennis nigris, pe- 

 dibus rufis, femoribus nigro-vittatis, tibiis apice tarsisque nigris, 

 alis subfulvis apice cinereis. 



Body hoary : head narrower than the chest, clothed behind and 

 beneath with white hairs, beset behind the eyes with a row of black 

 bristles ; sides of the crown covered with black hairs ; front clothed 

 with black hairs ; clypeus armed with long slender yellowish white 

 bristles : eyes dark bronze ; fore part nearly flat, composed of large 

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

 black, beset with long black bristles : feelers black ; first and second 

 joints beset with stout black hairs ; second joint a little shorter than 

 the first : ridge of the fore chest clothed with white hairs and beset 

 with black bristles : chest yellow, thinly clothed with black hairs, 

 and also on each side with a few white hairs, adorned with four 

 broad black stripes, beset on each side and hehind with some black 

 bristles ; breast and sides of the chest white, partly clothed with 

 white hairs: abdomen gray, narrower than the chest, and rather 

 more than twice its length, very slightly tapering from the base to 



