204 



TROPICAL MEDICINE AND HYGIENE 



Homalomyia canicularis is one of the commonest of these 

 causes of intestinal myiasis (figs. 79 and 80). It is generally 

 believed that the eggs or larvae are swallowed with raw 

 vegetables and pass through the intestinal canal where 



FIG. 79. Larva of Homalomyia. 



FlG. 80. Homalomyia canicularis. 



they undergo further development. This is almost cer- 

 tainly the case where, the rat-tailed larvae of Eristalis tenax 

 or of the cheese-maggot fly, Piophila casei, are passed 

 with the stools. 



