408 



THE ANIMAL PARASITES OF MAN 



jointed palpi, the final joint of which is thickened in the male. 1 In biting, 

 the labrum, which is swollen at its free end, is not introduced into the 

 wound like" the other mouth-parts, but is bent backwards. The labium 

 and hypopharynx push direct into the skin ; the maxillae and mandibles, 

 however, which are needle-like and serrated at the tips, penetrate with a 



FIG. 262. Head of a male (a) and of a female (b) Anopheles ; slightly enlarged. 

 (After Giles.) 



FIG. 263. Head of a male (a) and of a female (b) Culex. (After Giles.' 



saw-like movement. [The swollen free end of the labrum really means the 

 Idbellce^ two articulated pieces, supposed by some to be the labial palpi. In 

 most species the mandibles are not serrated at their ends. F. V. T.] The 



1 [This is only so in Anophelina and in the genus Theobaldinella, Neveu-Lemaire, 

 Grabhamia, Theobald, Acartomyia, Theobald, &c. In true Culex and many other 

 genera the male palpi are pointed. F. V. T.] 



