“ He asserted the view that only two primary subdivisions of the Nearctic Region should be made—a ‘Boreal’ province and a ‘Sonoran’ province. The former stretches from New England and the Great Lakes northwest across Canada to Alaska, and sends down long arms along the heights of the Alleghanies and the Rocky Mountains, and along the Pacific Coast, whose fauna is a mingled one. Everything south of this is ‘Sonoran,’ embracing nearly all the United States, a great area of the plains of Northwestern Canada, and all of Mexico except the low tropical coast-lands. ”

“ Subsequently Merriam announced the opinion that there was no reason for recognizing a ‘Central Province,’ and that too much stress had been laid upon the dissimilarities between Eastern and Western animals. ”