OR MOSQUITOES 



419 



There are two main types of larvae, the Anopheline and Culicine ; in the 

 former there is no respiratory siphon, in the latter the siphon is long or 

 moderately long. The head offers certain marked peculiarities which are of 

 specific value, this especially applies to the Anophelina, in which the frontal 



tlG. 275. 



Types of scales, a to k ; head and scutellar ornamentation, I to 5 ; forms of 



clypeus, 6 (Theobald). 



i, Head and scutellum of Stegomyia, &c. ; 2, of Culex and Mansonia ; 3, of 

 Howardina, JEdes, &c. ; 4, of Megarhinus and Toxorhynchites, &c. ; 5, of Cellia and 

 some other Anophelines ; 6 a', clypeus of Culcx : b', of Stegomyia ; c , of Joblotia. 



