98 



ELEMENTS OF GENERAL SCIENCE 



Finally each larva changes into another form, the pupa 

 (fig. 53, F), which lives in the water three days or more. 

 The pupa changes into the adult mosquito. The mosquito 



lives in the air, 

 but it lays eggs 

 on the surface of 

 the water. When 

 the eggs are pro- 

 duced, another 

 life cycle is be- 

 gun. 



In its larval 

 stage the mosquito 

 feeds upon very 

 small living things 

 in the water. It 

 frequently comes 

 to the surface and 

 protrudes through 

 the surface small 

 tubes by means 

 of which a fresh 

 supply of air is 

 gained. The adult 

 female mosquito 

 may secure its 

 food by biting 

 through the skin 

 and sucking the 

 blood from man 

 or other higher 

 animals. 



112. How mosquitoes carry malaria. When a mosquito of 

 a certain kind, Anopheles (fig. 54), feeds upon human blood, it 

 injects a small amount of salivary fluid into the wound that 



i .V 



FIG. 53. Life history of the mosquito 



The common mosquito (Culex). A, egg raft; B, eggs; 

 C, young "wrigglers," or larvae; D and E, views of 

 larvae; F, pupa; G and //, females; 7, male. A, B, C, 

 G, H, and /, somewhat enlarged ; D, E, and F very much 

 enlarged. After Howard 



