Mosquitoes and Yellow Fever 139 



which other diseases caused by similar organisms 

 may be transmitted by the parent to the offspring, 

 yet the most conservative investigators are waiting 

 for further proof. 



HABITS OF STEGOMYIA 



The whole fight against yellow fever, then is 

 directed, as we have seen, against the mosquito, 

 Stegomyia calopus. The habits of this species 

 are such as to make it easy in some respects to 

 combat. It is seldom found far away from human 

 habitation. The adults will not fly far. Once in a 

 house they usually stay there except when they 

 leave to deposit their eggs. 



On the other hand, some of these same habits 

 make it all the more dangerous. It will breed in 

 almost any kind of water, no matter how filthy, and 

 a very small amount will suffice. Thus any leaks 

 from water-pipes or drains, cisterns, small cans of 

 water or any such places may become dangerous 

 breeding-places. If conditions are unfavorable 

 there will often be developed small individuals 

 which can easily make their way through ordinary 

 mosquito-netting. 



Dr. Manson has pointed out an interesting 

 possible result of the crusade that is now being 

 waged against the yellow fever mosquitoes. The 



