FLIES AND OTHER HOUSEHOLD INSECTS 



17 



species^ which appear to be most abundant. It is very difficult 

 to keep these insects out of houses on account of their small size. 

 Dr Howard has listed these forms as likely to be disease carriers. 

 These little insects rarely enter the house unless attracted by- 

 overripe or canned fruit. The latter should.be hermetically sealed, 

 making it safe from injury, and stored in the cellar or other place 

 comparatively inaccessible to the flies, as soon as convenient. These 

 small flies can easily be destroyed with fresh pyrethrum powder. 



/ 



iij^-^ 



ir 



Fig. 2 Fruit fly: a, adult fly; h, antenna; c, base of tibin and first tarsal joint; 



d, pupariuni, side view; e, same, dorsal view; f, larva; g, anal segment of same; a, d, 



e, f, much enlarged; h, c, g, still more enlarged. (After Howard, U. S. Dep't Agric. 

 Div. Ent. Bui. 4. n. s. 1896) 



Malarial mosquito^ 



This is one of our native species. It is only recently that its 

 connection with the spread of malaria has* been established beyond 

 question, though there has long been a suspicion that some mos- 

 quitos might be responsible for this disease. 



Infection by malaria. Medical men, best qualified to pass upon 

 the question, unhesitatingly affirm that certain mosquitos are 

 responsible for the dissemination of this malady. Malaria, like 

 some other diseases, is caused by a specific germ. It is peculiar in 

 that it has to pass through certain changes within the body of 

 the mosquito before it can develop successfully in the human 

 system. Moreover, malarial mosquitos are harmless until they 

 have become infected by biting some person suffering from 



'D r o s o p h i 1 a a m p c 1 o p h i 1 a Locw and D. a m o c n a Loew. 

 'Anopheles ni a c u 1 i p c n n i s Mcign. 



