INSECTS AND BIRDS. 



299 



allel with it. Malaria has been proven in many 

 sections of the world to be entirely avoidable by pre- 

 venting the breed- 

 ing of malarial 

 mosquitoes, and by 

 the careful screen- 

 ing of windows 

 and doors in dwell- 

 ing houses. 



There is only 

 one kind of mos- 

 quito which can 

 carry yellow fever. 

 This is a small 

 mosquito with 

 banded legs and 

 silvery stripes on 

 the back between 

 the wings. It 

 breeds almost en- 

 tirely in cisterns, 

 when these are not 

 properly screened; 

 and in horse 

 troughs, rain bar- 

 rels, tin cans and 

 other receptacles 

 in which water is 

 allowed to collect. 

 The young stages 

 of all kinds of mosquitoes live in water and are famil- 

 iarly known as " wigglers." They develop very rap- 

 idly in warm weather, and may reach the adult or 

 winged stage in a week or ten days. In order to pre- 

 vent the breeding of mosquitoes all receptacles that 

 hold water, such as tin cans, should be removed or 

 buried. Horse troughs should be emptied every few 

 days. Wells and cisterns should be thoroughly 

 screened with some fine wire screening or cheese 



DISEASE-CARRYING MOSQUITO ABOVE. 

 COMMON MOSQUITO BELOW. 



