Abstract
umbellus) of Ontario was shown by Clarke (1936). He described a new species of blood parasite, Leucocytozoon bonasae, observed in a number of birds taken in 1933 and 1934 when the population was decreasing. He postulated again been falling off as revealed in questionnaires collected by the Royal Ontario Museum of Zoology. A survey of the blood parasites in birds collected in October and November 1942 and 1943 has been made and data in the ques-
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