30 



MOSQUITO ERADICATION 



brackish waters and waters contaminated with chemicals. 

 Metz' reports that he has found crucians breeding freely in water 

 so impregnated with noxious substances from the drain of a 

 chemical factory that fish were unable to live in it. 



A. crucians apparently is not quite so widely distributed as is 

 A. quadrimaculatus, its habitat evidently being somewhat more 



Fig. 30. — Anopheles crucians, female. 



restricted. Often, where it is found at all, it is found in great 

 abundance. 



A. PUNCTIPENNIS SAY 



This species may be distinguished from other common Ano- 

 pheles by- the fact that it carries a large square or oblong white or 

 yellowish patch at the anterior margin of the wing, near the 

 outer end. Sometimes, there is a blackish patch also noticeable. 

 The white patch is readily visible to the naked eye, and is 

 quite perceptible, even when the insect is in the resting position 

 with the wings crossed. The anterior margin of the wing is 

 dark, while the balance is lightly spotted with black, with an 

 almost invisible white spot at the extreme apex. 



The life-habits of A. punctipennis are similar to those of A. 



i" Some Aspects of Malaria Control Through Mosquito Eradication," 

 U. S. Public Health Service, 1919. 



