634 ASILID^ 



50 (51) Facial knob large. Genitalia of the male when seen from above 



not at all swollen but extending more or less to a point. 



Legs mainly black but obscured by minute pale pubescence. 

 Ovipositor never very long. Third veinlet from the discal cell rather 

 upright ; small cross-vein absent. 



TOLMEKUS. 



51 (50) Facial knob small. Genitalia of the male when seen from above 



more or less blunt. 



Small species. Legs mainly or usually extensively black. Third 

 veinlet from the discal cell unusually sloping. 



Ceedistus. 



52 (1) Arista illumed (fig. 361). Ommatius. 



Table of the Bkitish Species of ASILHST^. 



As the generic characters of the Asilince are difficult to follow and 

 the British species are often confounded by inexperienced students I 

 have attempted to give a "Table of Species" on more obvious even if 

 more superficial characters. 



1 (2) Very large, yellow and black, hornet-like fly. 



Wings obviously maculated on the hindmargin. Legs mainly 

 brownish red or orange. 



As. crah7vniformis. 



2 (1) Large or moderate-sized flies of inconspicuous blackish or greyish 



colour. 



Wings never maculated, though with the outer half conspicuously 

 darkened in P. germanicus. 



3 (4) Wings halved in colour (fig. 353), the base being whitish or hyahne 



and the apex conspicuously (unless immature) darkened. 



Large species. Tibiae reddish orange. Abdomen without any 

 bristles on the hindmargins of segments. 



Famp. germanicus. 



4 (3) Wings without any contrasts in colour, though often with a vague 



gloomy tint about the tip and hindmargin. 



5 (12) Legs altogether blackish, or at most with just the base of the 



tibise reddish. 



6 (9) Tibise black even at the extreme base. 



Rather large species. 



7 (8) Light grey species. Bristles mostly whitish, even on the legs and 



scutellum. 



Scutellum with only two bristles. Eighth ventral segment of the 

 male simple. Ovipositor with a circlet of spines (fig. 351). 



Phil, albiceps. 



8 (7) Brownish grey species. Bristles mostly black. 



Scutellum with more than two (usually black) bristles. Eighth 

 ventral segment of the male with a produced densely bristly process. 

 Ovipositor without any spines and with the terminal lamellae wedged 

 in (fig. 358). 



HiU. rufiharhis. 



