MYIASIS 217 



full grown it drops or is sneezed out" (Alcock, 191 1, p. 182). 

 The Sergents (1907) have described a similar type of human 

 myiasis occurring in Algeria due to CEstriis ovis. They state 

 that the fly deposits its ova while in flight, without settling, 

 upon the eyes, nostrils or lips of shepherds, especially those 

 who have eaten of fresh sheep or goat's cheese. The condition 

 is also found in dogs fed on cheese. 



Austen (1912) records a case of myiasis of the external 

 auditory meatus, accompanied by deafness and pain due to a 

 SyrpJius larva. 



LarviE discharged from the urethra. 



Although it would appear most unlikely for the larvae of flies 

 to be discharged from the urinary tract, yet there are a number 

 of records of such occurrences. Chevrel (1909) has summarized 

 the twenty-one cases of myiasis of the urinary tract which have 

 been recorded ; of these, including the one described by himself, 

 he considers seven t6 be authentic, ten probable, and four 

 doubtful. 



In most cases the larvae discharged, which were usually few 

 in number, appear to have been those of F. canicidaris. Chevrel 

 himself, however, records an instance in which a woman, aged 55, 

 suff"ered from albuminuria, and urinated with difficulty. Finally, 

 during one day she passed between thirty and forty larvae of 

 F. canicidaris of different sizes. 



One case only is recorded in England by Palmer (19 12, p. 12); 

 In this case a larva of F. scalar is was passed by a male patient. 

 The larva was identified by Austen (191 2, p. 12). 



C. LarvcB deposited on zvoiinds. 



Several species of flies have been known to deposit their ova, 

 or living maggots, in neglected wounds in man, and many species 

 do so on animals. The larvae soon burrow into the surrounding 

 tissues, often undermining the skin, and, unless removed in time, 

 cause extensive and terrible sores. Many instances have been 

 recorded from tropical countries, where the condition is fairly 



