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SOME NEW INTERNAL PARASITES OF THE CALIFORNIA 
GROUND SQUIRREL {OTOSPERMOPHILUS BEECHEYI). 
By CREIGHTON WELLMAN, 
Oakland, California, 
AND WM. B. WHERRY, 
Cincinnati, Ohio, U.S.A. 
(With 10 Text-Figures.) 
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 role played by 0. heecheyi in the maintenance 
of plague on our Pacific Coast was definitely established {vide Wherry, 
Journ. Infect. His. 1908, V. 485)^ all medical riien are naturally interested 
in the diseases which affect this rodent. Therefore the following brief 
descriptions of the parasites we have found are offered. 
Protozoa. 
Genus Leucocytozoon Danilewsky. 
Leucocytozoon citellicola sp. nov. 
Forms corresponding to trophozoits were present in considerable 
numbers in smears from the lungs, spleen, liver and inguinal glands. 
They were found almost entirely within the polymorphonuclear and 
1 See Parasitology, vol. ii. p. 297 {re fleas on rodents in California); Journ. of Hygiene, 
vol. IX. p. 1 (anti-plague measures in San Francisco) ; also .Journ. of Hygiene, vol. x. No. 4 
{re plague among ground squirrels in America). 
