Besseria. 113 



descending. Orbits and cheeks greyish silvery, the former in certain 

 light black on upper half ; jowls black, shining. Frontal stripe whitish 

 grey pruinose. Besides the ocellar and inner vertical bristles small 

 outer verticals present. Frontal bristles fme. Orbits with fme black 

 hairs, reaching a little down on the cheeks; jowls black-haired. 

 Occiput black and shining above, grey below, with black hairs above, 

 whitish below. Antennæ black, third joint somewhat longer than 

 second; arista thickened in basal half, apparently bare. The small 

 palpi yellowish. Tliorax black, somewhat shining; it is somewhat 

 yellowish grey pruinose in front of the suture, and here with two 

 narrow median and two broad lateral stripes; the humeri and sides 

 to the suture specially pruinose. Thorax is densely black-haired; no 

 posthumeral but an intraalar bristle present. Abdomen red with 

 lifth segment and a triangular spot with apex forwards on fourth 

 segment black; sometimes there is a more or less complete black 

 middle line. Abdomen is very densely black-haired with fme hairs, 

 and without bristles. Fifth sternite quite short, with a lamella-shaped 

 process at each side. Genitalia forming a black knob, bent inwards. 



Fig. 16. Wing of B. melanura ,^ . 



Legs black, shining, somewhat hairy, with the bristles fine and 

 hair-like. Wings slightly tinged, yellowish on basal part; veins brown; 

 first posterior cell somewhat long petiolate with the peduncle ending 

 before apex; discai angle obtuse and more or less rounded. Squa- 

 mulæ whitish or slightly yellowish. Halteres brownish. 



Female. Similar; frons a little broader; orbits black, shining; 

 frontal stripe brownish. Thorax black, shining, only pruinose on 

 humeri. Abdomen with sixth segment cylindrical, bent in under 

 venter, with a ventral process, furcate at apex; the last segment 

 cleft into two claws; sixth segment red to black, its ventral lateral 

 margins covered with short spinules; the lateral margins of second 



