OUR FRIENDS AND FOES 



157 



sene, about one ounce to fifteen square feet of water, 

 can be poured over pools of water which cannot be read- 

 ily drained. If the ponds are drained the breeding- 

 places are ruined. If fish are introduced they feed 

 upon the larva 1 and pupa\ If the surface of the water 

 is given a coating of kerosene, the pupsr, as they come to 



FIG. 125. Mosquito (Culex pungens), male. (After Howard.) 



the surface to emerge, will be killed, and the female 

 depositing her eggs on the surface will come in contact 

 with the kerosene. This will destroy her before she has 

 had an opportunity to deposit her eggs. These are three 

 effective remedies. The one best suited to the occasion 

 can be chosen. 



Mosquitoes are looked upon as annoying only in so far 

 as they directly disturb man. There are good reasons 

 for believing that mosquitoes may act as disseminators 

 of disease. It has been partly proven that mosquitoes 



