Species of Anopheles 47 



Anopheles pseudopunctipennis appeared to be 

 only slightly concerned in the transmission of 

 malarial fever, if at all, as only about twelve per 

 cent, of the specimens used became infected vmder 

 the most favorable artificial conditions. 



Anopheles malefactor did not become infected. 



It also appeared in some cases that even the sus- 

 ceptible mosquitoes possessed immunity toward 

 the malaria parasite and failed to become infected. 



Unfortunately, Anopheles alhimanus is the most 

 abundant of the Isthmian Anopheles, and it makes 

 stronger efforts to obtain entrance into inhabited 

 buildings than any other species. It seems to 

 prefer breeding places exposed well to the sun, and 

 the green algae in such exposed collections of water 

 provides food for its larvae. The larv« are found 

 in stagnant water but not when heavily charged 

 with sewage; and at the edges of streams and 

 rivers in places where there is practically no cur- 

 rent. Although they are found at the surface in 

 deep bodies of water when plenty of aquatic vege- 

 tation, debris, or other forms of protection are pre- 

 sent, yet they are frequently found in puddles 

 having a depth of only a fraction of an inch. 

 Even after the water disappears the larvae often 

 continue to live for some time under a layer of 

 algae or in the soft mud. The adult will fly a long 



