LIST OF DIPTERA. 455 



black bristles ; crown furnished with a few black hairs ; under-side 

 thickly clothed with white hairs ; clypeus armed with a thick tuft of 

 pale yellow bristles : eyes dark bronze ; fore part flat, very distinct 

 from the other part and with larger facets : lip black, shining, 

 clothed at the base with long, and at the tip with short yellow hairs : 

 feelers black ; first and second joints beset with black bristles : chest 

 with a slender indistinct pale stripe, clothed with short black hairs, 

 beset with black bristles on each side ; sides and breast whitish taw- 

 ny : abdomen compressed, tapering from the base to the tip, thinly 

 clothed with short yellow hairs, and on the hind borders of the seg- 

 ments with yellow bristles, much narrower than the chest and nearly 

 thrice its length ; segments from the third to the fifth long, and of 

 equal length; sixth joint shorter; seventh joint still shorter; 

 eighth joint as long as the seventh ; ninth joint longer, black, slen- 

 der, shining : legs ferruginous, clothed with short yellow hairs, and 

 beset with some stout black bristles of various length ; hips whitish 

 tawny, and clothed with white hairs : thighs furnished with some 

 long pale yellow hairs ; feet more thickly armed with bristles; claws 

 black ; foot-cushions pale brown : wings colourless, pale brown to- 

 wards the tips, and on the disks of the segments along the hind bor- 

 ders for half the length from the tips ; wing-ribs ferruginous ; veins 

 black, piceous towards the base, where they are ferruginous ; poisers 

 tawny. Length of the body 8 \ lines; of the wings 12 lines. 



a. Trenton Falls. Presented by E. Doubleday, Esq. 



Asilus Paropus, n. s., fern. Flavo-fuscus, thoracis lateribus pecto- 

 reque canis, abdomine apice nigro, antennis nigris, pedibus flavis, 

 femoribus apice nigris basi fasciisque fulvis, alis cinereis basi 

 limpidis. 



Head as broad as the chest, clothed with pale yellow down, fur- 

 nished behind with yellow hairs, and with a row of black bristles 

 along the rims of the eyes ; crown beset with some black hairs ; cly- 

 peus armed with black bristles behind, and with white bristles 

 in front : eyes black ; fore part slightly convex, hardly distinct from 

 the other part, and its facets are not much larger : lip black, shin- 

 ing : feelers black ; first and second joints beset with black bristles ; 

 third joint spindle-shaped, a little longer than the first and the se- 

 cond ; fourth and fifth joints slender, not one-third of the length of 

 the third : chest yellowish brown, furnished with some black hairs ; 

 sides and breast hoary, the former beset with black bristles : abdo- 

 men yellowish brown, clothed with very short yellow hairs, and 

 towards the tip with long black hairs, narrower than the chest, and 

 more than twice its length ; third, fourth, and fifth segments long, 



