228 



MYIASIS 



On the other hand several recent writers, amongst them 

 Soltau (1910) and Garrood (1910), have described cases in which 

 no discomfort was produced, and the larva; were noticed un- 

 expectedly in the motions. 



In England cases of intestinal myiasis due to the larvje of 

 F. scalaris have been recorded within the last few years, by 

 Cattle (1906), Garrood (1910) and Austen (1912) ; and the latter 

 writer, Stephens (1905), Hewitt (1909) and Soltau (1910) have 

 described cases due to the larvae of F. caniailaris. 



In England Austen (1912) has met with one case due to the 

 larvae of a Thcreva (? nobilitatcx), two cases due to the larvae of 

 a SyrpJiiLs or hover-fly, one case due to the ' rat-tailed maggot ' 



Fig. 24. I, Bot, or full grown larva of Gastrophilus eqtii ( x 3) ; 2, anterior extremity 

 with mouth-hooks ; 3, enlarged view of posterior extremity ; 4, part of one spiracle 

 greatly enlarged. 



of Eristalis tcnax, the drone fly, one due to the larva; ot 

 Antlwmyia radicuni, and two due to the larva; of Musca domestica 

 in infants. Stephens (1905) has described a case in an infant in 

 whose faeces the larvae of both M. corvina and F. caniailaris were 

 found. Cases due to the larva; of all these flies have been 

 reported on the continent. 



The larvae of the ' Bot ' flies are normally parasitic in 

 domesticated and other animals. Though human cases of 

 infection with Bot larvae have been recorded not infrequently 

 in Europe, Africa and America, no British cases of m}'iasis in 

 man certaiiih' due to these flics have been published. 



