PLATE 111. 



rr~ 



Fio. 2 



Fin. 4. 



Fie. 5 



Fio. 6. 



7/7. Fig 1. Head of a male " Culex " ; Fig. 2. Head of a female " Culex " ; fig. 3. Head of a male " Anopheles " ; Fig. It. Head of a female 

 "Anopheles" ; fig. 5.\ female "Culex," showing the position usually assumed when at rest on a surface,- Fig. 6. A female,, Anopheles, 

 showing the position usually assximed when at rest on a surface. 



