SIMULIIDAE OF AFRICA 



171 



Figs. 275-282. Form of the larval hypostomium in subgenera and species-groups of 

 African Simiilium. 275, Anasolen. 276, Freemanellum. 277, Xenosimulium. 278 and 

 and 279, Metomphalus, medusae forme-group. 280, Metomphalus, bovis-group. 281, 

 Metomphalus, albivirgiilatum-group, shape of apical teeth only. 282, Edwardsellum. 



