MOSQUITOES. 



241 



the mandibles above and the maxillae below. The serrations of the 

 maxillae are coarser than those of the mandibles. The sensory organs, 

 the palps, lie on either side of and slightly above the proboscis. These 

 are of the utmost importance in differentiating mosquitoes and must not 

 be confused with the antennae, which are attached above the palpi and 

 at the sides of the clypeus. These antennae are of importance in dis- 

 tinguishing the sex of the mosquito. 



FIG. 75. Anatomy of mosquito, i, Dorsal view of mosquito; 2, wing of 

 mosquito; A, costal vein; B, mid cross vein; C, posterior cross vein; D, first fork- 

 cell; E, second fork-cell; 3, various types of scales; a, flat head scales; b and c, 

 Mansonia wing scales; d, upright forked head scales; e f , g and h, various shapes 

 of thoracic scales. 



The thorax is largely made up of the mesothorax, at the posterior 

 margin of which is a small, sharply -defined piece, the scutellum; this 

 may be smooth or trilobed. Underneath and posterior to the scutellum 

 is the metanotum; the metanotum is bare in Culicinae, has hairs in 

 Dendromyinae and scales in Joblotinae. 



