146 



R. W. CROSSKEY 



57 



59 



61 



63 



58 



60 



62 



64 



Figs. 57-64. Form of adult head capsule in Simulium (left-hand figures) and in Afrosimulium 

 (right-hand figures), with sex as indicated. 57-60, posterior aspect ; 61-64, facial aspect, 

 with antennae omitted. 



