CHAPTEE XI 

 INSECT TYPE PROBLEMS: MOSQUITOES 



Mosquitoes and disease. The discovery that malaria and 

 yellow fever are transmitted by certain mosquitoes shows how 



FIG. 61. Anopheles mosquitoes and malaria in a city 



A, Anopheles mosquitoes breeding; dots, houses where malaria occurs. There 

 would be more dots in various parts if there were any houses 



important a r61e an insect may play in the affairs of human 

 life. No obstacles have so seriously blocked the progress of 

 civilization in the tropics as these two diseases. The Panama 



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