'56 



R. W. CROSSKEY 



156 



157 



158 



159 



160 



161 



T10 



CERCUS 



PARAPROCT 



GONAPOPHYSIS 



T10 



PARAPROCT 



GONAPOPHYSIS 



162 



163 



Figs. 156-163. Female terminalia of African Simulium. 156-161, schematic ventral views 

 showing form of the gonapophyses (ovipositor lobes) in : (156 and 157) subgenera Pom- 

 eroyellum, Eusimulium, Meilloniellum, Lewisellum and other subgenera with bluntly 

 rounded gonapophyses ; (158) subgenus Anasolen ; (159) subgenera Wilhelmia, Metom- 

 phalus and Edwardsellum with curled acuminate gonapophyses ; (160) Metomphalus, S. 

 wellmanni. (161) subgenus Xenosimulium with enlarged pointed and inwardly-directed 

 gonapophyses. 162 and 163, left lateral view of apex of $ abdomen showing form of 

 cerci and paraprocts in (162) most subgenera, and in (163) forms in subgenus Freeman- 

 ellum with enlarged paraprocts. 



