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While examining last year some California ground squirrels, we found among this rodent's endoparasites the following protozoa, worm and mite which appear to be new. Ordinarily the mere recording of new species of the parasites of wild animals is of little interest to physicians, but since the rô1e played by O. beecheyi in the maintenance of plague on our Pacific Coast was definitely established (vide Wherry, Journ. Infect. Dis. 1908, v. 485)1 all medical men are naturally interested in the diseases which affect this rodent. Therefore the following brief descriptions of the parasites we have found are offered.