THE INSECTS 



Intestinal Myiases 



In the tropics vague intestinal disturbances or violent abdominal 

 cramping may be brought about by dipterous larvae in the intestinal 

 canal. The symptoms may be those of a dysentery and may be at- 

 tended with fever and malaise. 



The larvae usually obtain access to the alimentary tract in food taken in by the 

 mouth. Flies of the genus Sarcophaga are prone to deposit their larvae on food, 

 especially meat that is somewhat tainted. Other flies, as Musca or Anthomyia, 



FIG. 89. Markings of breathing slits on posterior stigmata of various dipterous 

 larvae, i. Musca domestica, showing both stigmata; 2. Calliphora vomitoria; 3. 

 Stomoxys calcitrans. 4. Auchmeromyia luteola; 5. Cordylobia anthropophaga; 6. 

 Sarcophaga magnifica. 



may lay their eggs on food. Flies of the genus Anthomyia tend to lay their eggs on 

 plants. 



It is possible for a fly to deposit its eggs or larvae about the anus 

 while the man is at stool. 



Great care must always be observed to assure one's self that fly larvae, which may 

 be present in the stool, have not originated from larvae deposited on the stool subse- 

 quent to its passage. 



Aural Myiases 



While the larva of Chrysomyia macellaria, known as the "screw- 

 worm," is the one most frequently reported from the external auditory 



