SIMULIIDAE OF AFRICA 



167 



v^V- 



232 



233 



234 



235 



236 



237 



238 



239 



240 



Figs. 232-240. Dorsal head pattern in larvae of African Simulium (232-234 showing 

 forms with negative head-spots and 235-240 showing forms with positive head-spots). 

 232 and 234, subgenus Pomeroyellum. 233, subgenus Meilloniellum. 235 and 236, sub- 

 genus Eusimulium. 237, subgenus Anasolen. 238 and 239, medusaeforme-group of 

 subgenus Metomphalus. 240, subgenus Edwardsellum. 



