1 66 



R. W. CROSSKEY 



229 



230 



231 



Figs. 224-231. Larval body form and cuticular ornamentation in African Simulium. 224, 

 body shape in forms with ventral papillae. 225, types of seta or scale often associated 

 with body form shown in fig. 224. 226, body-shape in most forms without ventral papil- 

 lae, drawn from medusaeforme-group of Metomphalus. 227, simple setae sometimes as- 

 sociated with body form shown in fig. 226. 228, body shape in bovis-group of Metom- 

 phalus. 229, truncate scales associated with body form of bovis-group (228). 230, 

 body form in subgenus Edwardsellum showing dorsal abdominal tubercles and dense 

 covering of scales. 231, types of scale associated with body form of Edwardsellum (230). 

 For explanation of lettering a-d in Text-fig. 225 see text. 



