140 



R. W. CROSSKEY 



ventral 

 papilla 



secondary lobules 

 (thumb-like) 



secondary 



lobules 



(finger-like) 



10 



accessory 

 clerite(s) 



intermediate 

 teeth 



corner tooth 



median tooth 



hypostomial 

 setae 



apical 

 teeth 



mandibular 

 serrations 



12 



13 



Figs. 7-13. Structures of larval Simuliidae and their terms. 7, mature larva in profile. 

 8-10, forms of rectal gill. 11, lateral view of terminal abdominal structures. i2,hypo- 

 stomium. 13, apex of the mandible. 



