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feed readily, and the ovaries rapidly develop. 

 Eggs are laid, and, in most cases, the female dies 

 after their deposition. 



The adults of A. bifurcatus do not hibernate, 

 or only rarely. 



2. Hibernation of the Larva. — The larvae of 

 certain Anophelines, e.g., A. bifurcatus, appear able 

 to resist low temperatures, and are found even 

 when parts of the water are frozen over. Under 

 these circumstances they grow extremely slowly, 

 if at all. 



So also in the tropics, different species tide 

 over the ' cold weather ' in different ways. Thus 

 James found that M. culicifacies hibernated by 

 means of larvae only, little or no growth occurring 

 in these (t. 55° F. about) ; whereas Ce. pulcherrima 

 and N. fiiliginosus laid eggs which developed into 

 pupae and imagines. 



3. Hibernation of Eggs. — There is a certain 

 'amount of evidence to shew that eggs can survive 

 for some months in moist earth, exposed to frost, 

 etc. For young larvae have been found in fresh 

 pools in the winter, under conditions that made 

 it unlikely that the eggs had been deposited there 

 on the appearance of water. The resistance of 

 eggs to drying under a tropical sun is, however, 

 practically nil. 



Mode of Dispersal of Anophelinae 



There is no evidence existing at present to 

 show that mosquitoes habitually disperse any con- 

 siderable distance from their breeding-grounds. In 

 fact, the evidence is completely against such a dis- 

 persal, and, broadly speaking, the Anophelinae 



