LIST OF DIPTERA. 357 



bristles : breast covered with hoary bloom, and clothed with long 

 white hairs: abdomen slightly shining, clothed with short tawny 

 hairs, less than twice the length of the chest, which it nearly equals 

 in breadth at the base, but it diminishes thence to the tip ; sides fer- 

 ruginous ; segments from the third to the last successively decreas- 

 ing in length ; sides of the segments, from the first to the fifth, 

 clothed with long white hairs, and each of them adorned with a 

 patch of hoary down on the hind border ; sixth, seventh, and eighth 

 segments shining, thickly crossed with little furrows ; under-side 

 and lip ferruginous, the latter armed with short black spines : legs 

 black, clothed with short white hairs ; hips clothed with long white 

 hairs ; shanks ferruginous, armed with black and pale yellow spines ; 

 feet more thickly beset with black bristles and with black hairs; 

 fore joints ferruginous at the base ; claws black ; foot-cushions taw- 

 ny : wings colourless, brown at the base, on the fore borders, and 

 along the sides of the veins towards the tips ; wing-ribs and veins 

 black t poisers piceous, tips of the stalks and of the knobs tawny. 

 Length of the body 5 lines ; of the wings 9 lines. 



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



Dasypogon Lutatius, n. s. Niger, capite pectoreque canis, thorace 

 fusco lateribus argenteis, abdominis fas ciis interruptis canis, an- 

 tennis pedibusque nigris, alis subcinereis. 



Body black, slightly shining : head covered with hoary bloom, 

 clothed with long white hairs, and beset with a few black hairs on 

 the tubercle of the eyelets, and behind the rims of the eyes ; some 

 little furrows along the crown ; clypeus beset with black bristles : 

 eyes bronze, like those of D. Macerinus : lip black, clothed at the tip 

 with tawny hairs : feelers black ; first and second joints clothed with 

 a few long black hairs; first joint linear ; second joint club-shaped, 

 shorter than the first ; third joint irregularly spindle-shaped, longer 

 than the first and the second ; fourth and fifth joints like a spine, 

 which is not near half the length of the third ; sixth joint like a 

 short bristle : chest covered with a deep brown bloom, and adorned 

 with silvery down on each side, which is beset with a few black 

 bristles : breast covered with silvery down : abdomen a little nar- 

 rower than the chest and less than twice its length, almost linear till 

 near the tip, which is conical ; hind border of each segment adorned 

 with a hoary band, which is interrupted in the middle ; segments 

 clothed on each side towards the base with white hairs, decreas- 

 ing in length from the third to the last, thickly crossed with little 

 furrows ; tip armed with short black spines : legs black ; hips hoary, 

 and clothed with long white hairs ; thighs and shanks clothed with 

 tawny hairs, and the latter with black bristles ; feet beset with black 



