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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 s*pp. 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 
