58 



ANIMAL BIOLOGY 



to screen her house and so keep flies away from food, for one 

 never knows where these insects have been crawling or what 

 disease germs may be clinging to their feet. City authorities 



eggs larva pupa adult 



FIG. 41. Life history of house fly. 



should see that all street refuse and garbage are removed be- 

 fore flies of any kind can lay their eggs therein. All persons 



FIG. 42. Life history of potato beetle. Identify eggs, larvae, pupa 

 and adult. 



