MYIASIS CAUSED BY FA NX I A SPP. 303 



not recur and the evacuation of the larvae ceased shortly; the 

 patient's health gradually improved but not completely. The 

 author calls attention to the fact that the symptoms made their 

 appearance in the spring, but the larvae were not expelled until 

 the summer and autumn following. It would appear, therefore, 

 that they entered the stomach in the egg state and after hatching 

 passed into the intestine wliere they completed their growth. 

 From the description and figures which the author gives of these 

 larvae they would appear to be F. scalaris and not F. canicularis 

 as was supposed. 



In 1876 Judd described the discharge of the larvae of F. scalaris 

 from the intestine by a boy in Kentucky, U.S.A. 



Stephens (1905) records the passage of two larvae per 7'ectum, 

 one of which was described as F. canicularis and the other as 

 Musca corvina, but from the author's description I am inclined to 

 believe that the latter was M. doinestica. 



The occurrence in the intestine of a youth of what would 

 appear to be the larvae of one of these species of Fannia is 

 recorded by Cattle (1906). This patient consulted the author in 

 September 1905 and stated that he had passed the larvae a 

 basinful at a time per anion. For some weeks he had not been 

 feeling well and now complained of abdominal discomfort. The 

 chief trouble was apparently an imaginative one, induced no 

 doubt by the sight of the living larvae in his faeces. He had no 

 vomiting or other gastric or intestinal symptoms. The larvae 

 gradually left the patient although so late as March 1906 one or 

 two at a time were occasionally seen. 



Tulpius (1672) records the passage of 21 small larvae from the 

 urethra. From the figure which is given it would appear that 

 these are F. canicularis. In 1792 Veau de Launay recorded the 

 occurrence of and figured a larva which resembles F. canicularis. 



Chrevil (1909), in an admirable and complete summary of 

 previously recorded cases of myiasis of the urinary tract of which 

 a critical examination is made, gives an additional case of the 

 occurrence of the larva of F. canicularis in a woman of fifty-five 

 who suffered from albuminuria and urinated with much difficulty. 

 On May 26th thirty or forty larvae of F. canicularis of different 

 sizes were passed. 



