Accidental or Facultative Parasites 
140 
Muscina stabulans is re¬ 
garded by Portschinsky 
(1913) as responsible for 
many of the cases of intesti¬ 
nal mvasis attributed to other 
species. He records the case 
of a peasant who suffered from 
pains in the lower part of the 
breast and intestines, and 
whose stools were mixed with 
blood. F rom N ovember until 
March he had felt particu¬ 
larly ill, being troubled with 
nausea and vomiting in addi¬ 
tion to the pain in his intestines. In March, his physician prescribed 
injections of a concentrated solution of tannin, which resulted in the 
expulsion of fifty living larvae of Muscina stabulans. Thereafter 
the patient felt much better, although he suffered from intestinal 
catarrh in a less severe form. 
Calliphorinae — Closely related to the Sarcophagidae are the 
Calliphorince. to which group belong many of the so-called “blue 
bottle” flies. Their larvae feed upon dead animals, and upon fresh 
and cooked meat. Those of Pro- 
tocalliphora, already mentioned, 
are ectoparasitic on living nestling 
birds. Larvae of Lucilia, we have 
taken from tumors on living turtles. 
To this sub-family belongs also 
Auchqromyia luteola, the Congo 
floor maggot. Some of these, 
and at least the last mentioned, 
are confirmed, rather than faculat- 
tive parasites. Various species of 
Calliphorinae are occassionally met 
with as facultative parasites of 
103. Lucilia caesar, (x 3 ). After Howard. 
man. 
Chrysomyia macellaria, the screw worm fly (fig. 107), is the fly 
which is responsible for the most serious cases of human myasis in 
the United States. It is widely distributed in the United States 
102. Muscina stabulans (X4). After Graham 
Smith. 
