Abstract
When examining the contents of the alimentary canal of caddis-fly larvae, I found that in addition to certain well-known gregarines, they generally harbour several other interesting protist parasites which have not hitherto been described. Chief among these are: (a) a tricho-mastix, (b) a spirochaete, and (c) a flagellate which appears to be related to Macrostoma caulleryi, Alexieff. The present paper deals with the trichomastix and the spirochaete: I hope to describe the other flagellate fully in a future communication.

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