PHASES IN THE LIFE HISTORY OF NON-BITING FLIES 137 



readily separated by the large number of processes on all the seg- 

 ments. The posterior spiracles are located on raised processes and are 

 not plates as in the species mentioned above. In F. canicidaris there 

 are four lobes to the posterior spiracles and six finger-like lobes to the 

 anterior spiracles (see Hewitt, 1917) (see figs, li to 19). 



These flies breed in excrement, and in all kinds of decaying vegetable 

 matter and are often found in cases of intestinal myiasis. 



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Banks, Nathan, 1912. — The Structure of Certain Dipterous Larvae with 

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Bishopp, F. C, 1915. — Flies Which Cause Myiasis in Man and Animals. 

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Bishopp, F. C, and Laake, E. W., 1919. — The Dispersion of Flies by 

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Froggatt, W. W., 1915. — Sheep Maggot Flies. Dept. Agr., New South 

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Hewitt, C. G., 1917. — The House Fly. Cambridge Univ. Press. 



Howard, L. O., and Hutchison, R. H., 1915.— House Flies, U. S. Dept. 

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NicoU, W., 1911.— Journ. Hygiene, vol. 11, No. 3, pp. 381-389. 



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Patton, W. S., and Cragg, F. W., 1913.— A Textbook of Medical En- 

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Richardson, C. H., 1917. — The Domestic Flies of New Jersey. New Jer- 

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