CUUCIDiE. 



99 



mankind. The parasitic microorganism is a small pro- 

 tozoan which undergoes development in the red corpus- 

 cles of the blood, destroying them, and there seems to be 

 no way, in general at least, in which it may be transfer- 

 red from one person to another save by the activity of 

 these insects. Taken into the mosquito's stomach with 

 the blood sucked up by the insect it there undergoes 

 sexual regeneration, of which the newly generated germs 

 or 'blasts', penetrating the walls of the mosquito's stom- 

 ach, reach the salivary glands, and are thence transfer- 

 red with the poisonous saliva emitted by the insect into 

 the wounds made by its puncturing 'bites'. 



#■ 



Fi£. 30. Culex taeniorhynchus. 1, female adult ; 2, front claws 

 of female; 3, front, 4 middle, 5, hind claws of male; all much enlarged. 

 After J. B. Smith. 



