SIMULIIDAE OF AFRICA 



145 



46 



48 



55 



56 



Figs. 45-56. Larval characters of African Prosimulium s.l. 45, form of the postgenal 

 cleft and elongate blackened apex of hypostomium. 46, typical form of the hypo- 

 stomium. 47, antenna, showing short darkened third segment. 48, head of subgenus 

 Procnephia showing head-spots and shape of cephalic apotome, cephalic fans omitted. 

 49-53, form of apical teeth of hypostomium in (49 and 50) subgenus Procnephia and in 

 (51-53) subgenus Paracnephia. 54 and 55, apex of mandible showing usual form of mand- 

 ibular serrations in (54) subgenus Procnephia and in (55) subgenus Paracnephia. 56, 

 maxilla showing dense dark tuft of hairs near base of maxillary palp. The arrows in figures 

 54 and 55 draw attention to the enormously enlarged third comb-tooth of the mandible 

 characteristic of Prosimulium. 



