106 DURHAM DIPTERA. 



XVIII. 



37 (40). Facial knob small, scarcely taking up the lower half 



of the face. 



38 (39). Abdomen grey. 



174. Philonicus, Lw. 



958. Philonicus albiceps, Mg. 



It is common on the sandhills below Hart Station, 

 where it lies in bare places among the bent grass, 

 looking like a piece of broken twig, and so is 

 easily overlooked. When disturbed it only flies a 

 few yards and then settles again. The males are 

 much commoner than the females. 



39 (38). Abdomen black with white hind margins. 



171. Rhadiurgus, Lw. (955. variabilis, Ztt.) 



40 (37). Facial knob large, and always taking up more than 



the under half of the face, often three-quarters. 



41 (42). Legs spotted or streaked with black and yellow. 



175. Epitriptus, Lw. (969. cingulatus, F.) 



42 (41). Femora black, tibiae bright yellow, not spotted. 



43 (44). Wings brownish on the apical half, much lighter on 



the basal half; milk-white in the male. 



172. Pamponerus, Lw. (956. germanicus, L.) 



44 (43). Wings uniformly brown or yellow, sometimes clear. 



45 (46). Dorsum not spotted. 



173. Antipalpus, Lw. (957. varipes, Mg.) 



46 (45). Dorsum spotted. 



176. Neoitamus, O-Sack. (960. cyanurus, Lw.) 



Family XIX.— BOMBYLID^. 



Mostly thick bodied, hairy, bee-like flies, with very large, 

 extended, often beautifully marked wings, by means of which 

 they hover, apparently motionless, in front of a flower into 

 which the long proboscis is plunged in search of the nectar. 

 In some genera the proboscis is short. 



TABLE OE GENERA. 



1 (2). Frons broad in both sexes. 0.4 2 open. Proboscis 

 short. Anthrax, Scop. (180) 



