34 



MALARIA 



wings provides a basis for distinguishing the genera, as 

 illustrated by Fig. 14. Stephens and Christophers 



state, viz. : "The genus Anopheles 



. has upright 

 forked scales 

 only on the 



head All 



mosqui toes 

 belonging to 

 the genus Cu- 

 lex have on the 

 head (1) nar- 

 row curved 

 and (2) up- 

 right forked, 

 but only (3) 

 a few flat 

 scales later- 

 ally ; whereas 

 all mosquitoes 

 belonging to 

 the genus Ste- 

 gomyia have 

 on the head 

 (1) no narrow 

 curved scales, 



(2) a few upright forked, and (3) flat scales covering 



the whole of the head." 



The ungues or tarsal claws arc also useful characters 



in classification locally considered. In some species 



Fig. 10. Con-thru, often mistaken for a mosquito. 

 Smith.) 



(After 



