444 LIST OF DIPTERA. 



Asilus Triopas, n. s., mas. Canus, thoracis vittis quatuor cinereis, 

 abdomine fulvo, antennis femoribusque nigris, pedibus fulvis, 

 alis subfuscis, venarum marginibus apice limpidis. 



Body hoary: head a little narrower than the chest, clothed 

 with pale yellow hairs, beset with a row of black bristles behind the 

 eyes, and with a few black hairs on the crown ; clypeus armed be- 

 hind with black bristles, and in front with more and longer pale 

 yellow bristles ; sides of the front pale tawny : eyes black ; fore part 

 nearly flat, not very distinct from the other part, and with but little 

 larger facets : lip black, shining, clothed at the base with long, and 

 at the tip with short yellow hairs : feelers black ; first joint thickly 

 clothed with longer yellow hairs and black bristles ; second joint 

 clothed with short yellow hairs, much shorter than the first ; third 

 joint spindle-shaped, nearly as long as the first and the second ; 

 fourth and fifth joints like a bristle, as long as the third : chest with 

 four indistinct dark gray stripes, clothed with black hairs, and beset 

 on each side and behind with black bristles : breast with a few pale 

 yellow hairs : abdomen dark tawny, rather paler beneath, tapering 

 from the base to the tip, much narrower than the chest, and about 

 twice its length ; segments from the third successively decreasing 

 in length : legs tawny, clothed with pale yellow hairs, and beset 

 with black bristles ; hips and thighs black ; claws black, tawny at 

 the base ; foot-cushions tawny: wings light brown ; areolets towards 

 the tips with colourless borders : wing-ribs ferruginous ; veins 

 black, piceous at the base ; poisers tawny. Length of the body 1\ 

 lines; of the wings 13 lines. 



Asilus Alastor, n. s., mas. Cinereus, thoracis vittis duabus latis 

 albidis, pectore albo, abdomine cano unifasciato apiceque pilis 

 argenteis ornato, antennis nigris, pedibus cinereis, alis limpidis. 



Body dark gray : head as broad as the chest, clothed behind 

 and beneath with white hairs, furnished with a few black hairs on 

 the crown; clypeus thickly armed with long white bristles: eyes 

 large, dark bronze ; fore part nearly flat, its facets rather large : lip 

 and palpi black, the latter clothed with short black bristles; first 

 and second joints of the feelers black, and clothed with black hairs ; 

 second joint shorter than the first: chest with two broad whitish 

 stripes on the disk, clothed with short black hairs, and beset on each 

 side with black bristles : breast white, and thinly clothed with white 

 hairs: abdomen tapering from the base to the tip, rather narrower 

 than the chest, and much more than twice its length, clothed with 

 short black hairs, adorned with a broad hoary band just beyond the 

 middle, and with a tuft of silvery white hairs at the tip : legs dark 



