A nthyomyiidce 
i39 
4 p. m. , with five grain doses of salol four times a day. The customary 
parasiticides yielded no marked benefit. At the time of the report 
the patient passed from four to fifty larvae per day, and was showing 
some signs of improvement. The nausea had disappeared, her 
nervousness was less evident, and there was a slight gain in weight. 
The case was complicated by various other disorders, but the 
symptoms given above seem to be in large part attributable to the 
myasis. There is nothing in the case to justify the assumption 
that larvae were continuously present, for years. It seems more 
reasonable to suppose that something in the habits of the patient 
favored repeated infestation. Nevertheless, a study of the various 
cases of intestinal myasis caused by these and 
other species of dipterous larvae seems to indi¬ 
cate that the normal life cycle may be con¬ 
siderably prolonged under the unusual conditions. 
The best authenticated cases of myasis of the 
urinary passage have been due to larvae of 
Fannia. Chevril (1909) collected and described 
twenty cases, of which seven seemed beyond 
doubt. One of these was that of a woman of 
fifty-five who suffered from albuminuria, and 
urinated with much difficulty, and finally passed 
thirty to forty larvae of Fannia canicularis. 
It is probable that infestation usually occurs 
through eating partially decayed fruit or vege¬ 
tables on which the flies have deposited their 
eggs. Wellman points out that the flies may 
deposit their eggs in or about the anus of 
persons using outside privies and Hewitt 
believes that this latter method of infection is probably the common 
one in the case of infants belonging to careless mothers. “Such 
infants are sometimes left about in an exposed and not very clean 
condition, in consequence of which flies are readily attracted to them 
and deposit their eggs.” 
Muscinae—The larvae of the common house-fly, Mnsca domestica, 
are occasionally recorded as having been passed with the feces or 
vomit of man. While such cases may occur, it is probable that in 
most instances similar appearing larvae of other insects have been 
mistakenly identified. 
101. Larva of Fannia 
scalaris. 
