. Bulletin. Natural history; Natural history. 556 In the case of- this species it is probably always easier, by thor- ough tillage, to prevent its becoming a pest than to destroy it after it has become abundant. MOLE MEADOW-MOUSE; MOLE-LIKE VOLE. Microtus pinetorimi scalopsoides (Audubon and Bachman). Arvicola scalopsoides Aud. and Bachm., Proc. Acad. Nat. Sci. Phil., I., 1841, p. 97. I have never identified an individual of this species among our specimens, and I doubt if it is found in this county. Kennicott reports it as common in the northern part of the state. He says that it is readily d
. Bulletin. Natural history; Natural history. 556 In the case of- this species it is probably always easier, by thor- ough tillage, to prevent its becoming a pest than to destroy it after it has become abundant. MOLE MEADOW-MOUSE; MOLE-LIKE VOLE. Microtus pinetorimi scalopsoides (Audubon and Bachman). Arvicola scalopsoides Aud. and Bachm., Proc. Acad. Nat. Sci. Phil., I., 1841, p. 97. I have never identified an individual of this species among our specimens, and I doubt if it is found in this county. Kennicott reports it as common in the northern part of the state. He says that it is readily distinguished from the other meadow-mice "by its smaller size, glossy fur, large muzzle, small^yes, and very short ; In technical works the distinction is based on the number of mammae and the form of the teeth. The mammae in this species are four in number, while there moir^eidow-mousT""(Bafie")™ °' arc eight iu the othcr species of Microtus found in the state. In this species (Fig. 3), the enamel pattern of the third molar forms two triangles, while in the other species it forms three (Fig. 1 and 2). This meadow-mouse inhabits woods rather than open fields, and was called the wood meadow-mouse by Kennicott. Otherwise, so far as known, its habits are in general similar to those of the other meadow-mice. MUSKRAT; MUSQUASH. Fiber zihethiciis (Linnseus). Castor zibethicus Linn., Syst. Nat., I., 1766, p. 79. The muskrat, under several subspecies, is found generally through- out North America from northern Mexico to Hudson Bay. The range of the typical form which is found in Illinois is given by Elliot as "Labrador to the Gulf States, excepting possibly the Dismal Swamp, Virginia, and from the Atlantic Coast to the Rock>' Moun- tains north of the Gulf States and Arizona, and south of Keewatin, ;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
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