FOES AND FRIENDS OF THE PLANT 



207 



These two kinds of mosquitoes look much more nearly 

 alike when they rest on a vertical wall. The principal dif- 

 ference is that the one which carries malaria holds its body 

 straight, while the other looks somewhat humpbacked. 



Mosquitoes with no 

 spots on the wings 

 carry no malaria. Not 

 all kinds with spotted 

 wings carry malaria, 

 but only those which 

 seem to have three 

 beaks, as shown in the 

 figure. Of these, only 

 those which actually 

 bite are of any impor- 

 tance. 



If you find any of the 

 wrigglers, bring them 

 indoors and place them 

 in a tumbler filled with 

 water. Tie a piece of 

 cloth over the top, so 

 that when they be- 



FIG. 120. Wriggler (larva) of a mosquito 

 Come mosquitoes they which does not carry malaria. 



cannot fly away. If 



they are of different kinds, put them in separate tumblers. 

 Figures 119 and 120 show two different sorts. The one 

 shown in figure 119 becomes a mosquito which carries ma- 

 laria, as shown in figure 117. The one shown in figure 120 

 becomes a mosquito like the one seen in figure 118, which 

 carries no malaria. The first one acts as though it were 

 lighter than the water; it lies close to the surface and 

 seems to have difficulty in moving downward, while the 



