INSECTS 



211 



Diseases of man are carried on the feet and mouth parts 

 of house flies (Fig. 129). The swarms of flies seeking suitable 

 places to lay their eggs visit all kinds of filthy places. Again 



Fig. 128. — A Tachinid fly: its eggs on body of caterpillar, larva and pupa. 

 Smith's "Insect Friends and Enemies.") 



(From 



these same flies visit the kitchens and dining rooms in search 

 of food. Germs of disease, as well as others, are carried 

 from the filthy places to the food over which they crawl. 

 House files may well be called typhoid flies. 



Fig. 129. — The house fly: larva with details at right, pupa case at left. (From 

 Smith's "Insect Friends and Enemies.") 



Two good remedies are easy to apply. (1) Clean up the 

 near-by garbage heaps and fllthy places where flies could 

 breed. Sprinkle diluted carbolic acid all about such places 



