<>n tin' Iinii<l>i/Iiii! Fdinni of SoufJi Afrii-n (Diptera). 



46 (3). Prothorax much developed and beset with strong bristles (Toxo- 



phorinae) .... Toxophora, Meig. 



47 (2). Occiput prominent, bilobato above, with a central cavity, and with 



the fringe placed at the border of this cavity (Cylleniinae). 



48 (53). Ocelli well developed ; metapleurae bare. 



4! l (52). Second longitudinal vein not recurrent; first posterior cell open; 

 three submarginal cells present. 



50 (51). A marginal cell only . . . Nomalonia, Bond. 



51 (50). Three marginal cells . Henica, Macq. 



52 (49). Second longitudinal vein recurrent; first posterior cell closed; two 



submarginal cells ..... Penngueyimyia, Big. 



53 (48) Ocelli not distinct ; metapleurae hairy . . Tomomyra, Wied. 



54 (1) Hind border of the eyes indented-; eyes with a more or less distinct 



bisecting line ; occiput always prominent and bilobate above. 



55 ((30). Origin of the second longitudinal vein beginning before the middle 



cross- vein, and usually at acute angles with it (Lomatiinae). 



56 (59). Origin of the second longitudinal vein acute and distant from the 



middle cross-vein. 



57 (58). Middle cross-vein placed much beyond the middle of the discoidal 



cell ; eyes of the male separate ; two submarginal cells. 



Lomatia, Meig. 



58 (57). Middle cross-vein a little before the middle of the discoidal cell; 



eyes of male united ; three submarginal cells . Pteraulax, gen. nov. 



59 (o(j). Second longitudinal vein originating at an obtiise angle and rather 



near to the middle cross-vein . . . Petrorossia, Bezzi. 



60 (55). Origin of the second longitudinal vein quite opposite to the middle 



cross-vein, or nearly so (but a little before it in the gen. Synt&esia). 



61 (64). Third antenna! joint with a pencil of hairs at end; squarrmlae with 



hairy fringe ; metapleurae bare (Anthracinae). 



62 (63). Third antennal joint broader than the second, and with a produced 



margin ; wings with a broad black pattern, and often dimidiate. 



Anthrax, Scop. 



63 (62). Third antennal joint globular, inserted into the cup-shaped second 



joint and not broader ; wings only with infuscated spots at cross- 

 veins and bifurcations .... Spongostylum, Macq. 



64 (61). Third antennal joint without terminal pencil of hairs; squamulae 



with scaly fringe ; metapleurae hairy (Exoprosoplnae). 



65 (72). Two submarginal cells only, or very rarely three; ocelli placed at 



vertex or nearly so ; claws usually not toothed. 



66 (71). Front tibiae beset with distinct spiciiles; proboscis short, retracted, 



with fleshy terminal flaps ; third posterior cell long. 



67 ( 70). Face rounded, not prominent, never very convex ; second longitudinal 



vein originating quite opposite to the middle cross-vein ; third anten- 

 nal joint globular, quickly attenuated into a long, thin filiform style. 



68 ((59). Mouth-opening developed as usual, like the proboscis; facial plate 



short ; thoracical macrochaetae well developed . Villa, Lioy. 



69 (68). Mouth-opening very small, with the proboscis rudimentary; facial 



plate very long and broad ; no thoracical macrochaetae. 



Oestranthrax, Bezzi. 



