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Intestinal Myiasis 
Recorded Gases of Intestinal Myiasis. 
The following are some of the instances of intestinal myiasis and 
allied conditions I have found in the literature at my disposal. 
Cattle (1906) records a case of intestinal invasion by larvae of the 
bot-fly with few symptoms, but the larvae were still being discharged 
seven months after he first saw the patient. 
Hutton (1901) describes various symptoms such as vomiting, 
constipation with diarrhoea, epigastric pain, colic, and even haema- 
temesis. These symptoms may be promptly relieved by the evacuation 
of the parasites either by the mouth or anus. As large a quantity as a 
quart lias been said to have been expelled at one time. Sometimes the 
conditions may become chronic, intervals of quiescence being followed 
by a return of the symptoms. 
Thebault (1901) reports a case of Typhoid-like illness in a young 
woman who habitually ate Camembert cheese full of the mites Piophila 
casei. He fed a dog on fifty of the same mites and the animal became 
ill, passing blood in the faeces. At autopsy the dog’s internal organs 
were found to be congested and the mucous membrane of the small 
intestine was the seat of numerous small haemorrhages, Thebault 
thinks the illness of intestinal myiasis may be due to bacterial invasion 
of the wounds in the intestinal mucosa, caused by the sharp processes of 
the larvae, and also to the absorption of poisonous substances from the 
larvae themselves. 
Drew (1906) states that in the horse the stomach may be so closely 
set with the larvae of the bot-fly that the mucous membrane is invisible, 
and yet the animal shows no symptoms. 
Habits of these flies and their larvae. 
Braun (1906) states that Homalomyia canicularis is a common fly 
in houses and that the larvae have been found in decaying vegetable 
matter, also in the nests of the humble bee. 
According to Hewitt (1909) the larval stage of II. canicularis lasts 
from three to four weeks and the pupal stage from two to three weeks. 
The larvae feed on waste vegetable and faecal matter. 
