Abstract
During the summer of 1947, two of my students in a course in parasitology at the University of Minnesota Biological Station on Lake Itasca, Minnesota (Messrs. R. L. Butler and E. J. Smith), collected some specimens of Schistotaenia from a Pied-billed Grebe (Podilymbus podiceps) taken on the prairies about 30 miles west of Lake Itasca. When it appeared that these worms constituted a new species, these students kindly supplied the writer with all the available specimens for study. Mr. Robert Rausch, at the University of Wisconsin, kindly supplied material belonging to this genus, which he had in his collection, for study and comparison. In this material are specimens from grebes in Ohio and Michigan collected by himself, and also some specimens sent to him by Van Cleave from the Illinois Natural History Survey. All of these specimens except those from one grebe taken near Greenville, Ohio, appear to be cospecific with the Minnesota specimens, although showing wide variation, between individual hosts, in width of the worms. The specimens from the Greenville grebe, however, are strikingly different, and represent a welldefined separate species.
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