318 
Intestinal Myiasis 
Between the first and second segments on either side are the 
anterior spiracles ending in a palmate structure having nine lobes. 
The posterior spiracles are two knob-like bodies on the dorsal sui’face 
of the hind end of the body and in some specimens the air vessels can 
be seen on either side joining the anterior aud posterior spiracles and 
throwing off branches amongst the tissues. 
Owing to the many sharp spine-like processes the larvae become 
readily covered with dirt, and as the processes point principally back¬ 
wards intestinal movements would result in a forward displacement of 
the larva. This and the possible occurrence of retrograde peristalsis 
will account for some of the cases where the larvae are vomited as well 
as discharged by the rectum. 
REFERENCES. 
Braun, M. (1906). The Animal Parasites of Man. London, Wm. Ball, Sons.and 
Danielsson. 
Cattle, C. H. (1906). A case in which large quantities of dipterous larvae were 
passed per anum. Brit. Med. Journ. ii. 77. 
Drew (1906). A case of invasion by dipterous larvae. Brit. Med. Journ. ii. 1066. 
Hewitt (1907). On the bionomics of certain calyptrate muscidae. Journ. Econ. 
Biol. ii. pt. 3. 
Hewitt (xii. 1909). The structure, development and bionomics of the housefly. 
Quart. Journ. Microscop. Sci. liv. pt. 3. 
Howard (xii. 1900). A contribution to the study of the insect fauna of human 
excrement. Proc. Washington Acad. Sci. ii. 541. 
Hutton (1901). Article “Myiasis” in Encyclopaedia Medica , vnr. 212. 
ThAbault (1901). Haemorrhage intestinale et affection Typhoide causee par des 
larves de diptere. Arch. de. Parasitol. iv. 353. 
