122 



fourth and fifth abdominal segments close by the 

 posterior portion of the mid-gut, hind-gut, and mal- 

 pighian tubes towards the venter, so that eventually . 

 the ovaries occupy nearly the whole of the posterior 

 portion of the abdomen. Each ovary consists of very 

 many follicular tubes, each containing egg follicles in 

 different stages of development. In the mature ovary 

 the lower follicles have in every tube become the large 

 completely-formed egg (Fig. 47). 



The oviducts are muscular tubes passing from the 

 ovaries. They join beneath the rectum to form the 

 common oviduct, which is still more abundantly 

 supplied with muscle fibres, and which eventually 

 opens beneath the anus. 



The spermatheca is a chitinous sac, which in the 

 impregnated female is filled with a mass of spermatozoa. 

 Its duct is long and twisted and opens into the common 

 oviduct near its termination. (In Culex spp. there 

 are three spermathecae.) 



The mucus gland, globular or ovoid in shape, 

 opens by a short duct into the same region. 



The Fat-body. The adipose tissue is disposed in 

 two ways. 



1. As a general lining to the body wall, being 

 nearly everywhere present directly beneath the cuticle, 

 and 



2. As lobular masses lying in among the organs 

 and muscles. Thus a large pad lies over the compound 

 thoracic ganglion, and sends processes which lie in 

 among the salivary glands and other viscera. Other 

 smaller masses lie in the head and abdomen. 



HISTOLOGY 



Methods. The examination of the fresh tissues 

 frequently reveals structures not easily seen in fixed 



