REMARKS ON MOSQUITOES 



549 



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 saw-like movement. [The swollen free end of 

 the labrum really means the labelled, 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.~l The saliva is introduced into the wound through the lumen of the 



FIG. 385. Head of a male (a) and of a female (/;) Anopheles. Slightly enlarged. 



(After Giles.) 



(a) 



i 



FIG. 386. Head of a male (a) and of a female (b) Culex. (After Giles.) 



hypopharynx, while the blood is sucked up by the mosquito in the groove of the 

 labium. 



The three thoracic segments are soldered together. The central one carries the 

 membranous wings on the sides of the dorsal surface ; the posterior somite carries 

 the small halteres (rudimentary posterior wings). There are three pairs of long 

 slender legs on the lower side. 



