. Bulletin of the Illinois State Laboratory of Natural History. Natural history. 551 PENNSYLVANIA MEADOW-MOUSE. Microtus pennsylvaniciis (Ord). Mus pennsyivanica Ord, Guthrie's Geogr., 2d Am. ed., II., 1815, p. 292. Arvicola riparius Kennicott, Trans. 111. State Agr. Soc, II., (1856-57), p. 677. This species was called the long-haired meadow-mouse by Kenni- cott. It has not yet been found in Champaign county. There are several specimens in the collections of this Laboratory that were taken near Normal, in McLean county, and I took two specimens in a tamarack swamp in McHenry county. Like the p
. Bulletin of the Illinois State Laboratory of Natural History. Natural history. 551 PENNSYLVANIA MEADOW-MOUSE. Microtus pennsylvaniciis (Ord). Mus pennsyivanica Ord, Guthrie's Geogr., 2d Am. ed., II., 1815, p. 292. Arvicola riparius Kennicott, Trans. 111. State Agr. Soc, II., (1856-57), p. 677. This species was called the long-haired meadow-mouse by Kenni- cott. It has not yet been found in Champaign county. There are several specimens in the collections of this Laboratory that were taken near Normal, in McLean county, and I took two specimens in a tamarack swamp in McHenry county. Like the prairie meadow-mouse, this species rarely leaves the shelter of dense low-growing vegetation. It is found in wet mead- ows, in waste corners of cultivated fields, and in woodlands and wooded swamps. Its nests are said not to be in burrows but under stumps, logs, etc. In winter it is sometimes found on the surface of the ground, with no cover but the deep snow. In such situations pig, i. Moiar enamel pat- the heat of the animal forms a large dome J^ome^ ^TBTiieyT''''"''''^°'''" beneath the snow% and from this many run- ways extend in all directions. When the snow thaws, these nests are deserted. The underground burrows of this mouse are shallow and simple, often not extending beyond the log or other cover under which they are dug. The species is said to breed from March to November inclusive. There are probably three litters of five to eight in a year. The economic relations of this species are similar to those of the prairie meadow-mouse, but the species is so rare, in this part of the state at least, that it has practically no economic importance. PRAIRIE MEADOW-MOUSE; PRAIRIE-VOLE. Microtus austcrus (Le Conte). Arvicola aiisterus Le Conte, Proc. Acad. Nat. Sci. Phil., VI., 1853, pp. 405-406. The range of this species, according to Bailey*, is the central part of the Mississippi Valley, from southern Wisconsin to southern Missouri and Fort Reno, Oklahoma, and west in
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