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LEAFLET 18 6, U. S. DEPARTMENT OF AGRICULTURE 



tinue throughout the winter. The yellow-fever mosquito is killed by 

 cold weather in the northern part of its range; farther south it may 

 overwinter in the egg stage or, under exceptionally favorable condi- 

 tions in buildings, it may continue 

 breeding during the winter. In the 

 extreme southern portions of this coun- 

 try and in the Tropics it breeds the year 

 around. In all parts of this country, 

 however, breeding is greatly retarded 

 in winter. 



How to Control Domestic 

 Mosquitoes 



Elimination of Breeding Places 



Since domestic mosquitoes breed in 

 so many places, it is important to make 

 frequent inspections of the premises and 

 eliminate, as far as possible, all tem- 

 porary water containers. Tin cans, 

 bottles, jars, old tires, and the like 

 should be promptly disposed of. A 

 good practice for every housewife to 

 follow is to see that every tin can has holes punched in the bottom or has 

 both ends removed and the can flattened. Eaves troughs should be 

 examined occasionally to see that they are not stopped up or sagged 

 so that they will hold water. Likewise flat roofs should be examined 

 after rains to see that water is not held on them. Cesspools and septic 



Figure 5. — Pupa, or tumbler, of 

 the yellow-fever mosquito. 

 About 10 times natural size. 



Figure 6. 



Egg raft of the northern house mosquito as it floats on the \vater. 

 About 60 times natural size. 



tanks must be tightly covered, that is, so as to exclude all mosquitoes. 

 Rain barrels or tubs in which water is stored are often the source of 

 hordes of mosquitoes. Cisterns, whether above or below ground, 

 often breed many of these pests. Open cisterns breed mosquitoes in 



