SANITATION 



427 



The mosquito is responsible to a large extent for the 

 spread of two diseases, malaria and yellow fever. 

 When it pierces the skin of a sick person, germs are 

 taken into its body. These may then later be injected 

 into the body of a well person. 



The eggs of the mosquito are laid on the water. 

 These soon hatch into " wrigglers. " which later develop 



Fi&r 191. Life history of 

 common mosquito. A, B, eggs ; 

 C, E, larvae; D, pupa; F, 

 adult. After Howard. 



Fig. 192. A, position of 

 malaria mosquito (Ano- 

 pheles) -when at rest, B, 

 position of common house 

 mosquito (Culex) when at 

 rest. After Howard. 



into the adult mosquito.. The wriggler lives in the 

 water, but it must frequently come to the surface to 

 get air. To get rid of the mosquito we must destroy 



