. The Canadian field-naturalist. 1994 Notes 227. 50 100 Kilometers Figure 1. Range of Sorex arcticus [after Hall (1981)], extent of the Driftless Area in Minnesota [hachured line after Hobbs and Goebel (1982)], previous specimen localities in Minnesota [after Hazard (1982)], and new locality (*). patterns. The southward range extension of S. arcti- cus reported here may be another example of this phenomenon. Lastly, the range of S. arcticus in Minnesota may be disjunct and the population in Houston Co. may be relictual. Sorex arcticus occurred on the Great Plains during the Pleistocene (Stewar
. The Canadian field-naturalist. 1994 Notes 227. 50 100 Kilometers Figure 1. Range of Sorex arcticus [after Hall (1981)], extent of the Driftless Area in Minnesota [hachured line after Hobbs and Goebel (1982)], previous specimen localities in Minnesota [after Hazard (1982)], and new locality (*). patterns. The southward range extension of S. arcti- cus reported here may be another example of this phenomenon. Lastly, the range of S. arcticus in Minnesota may be disjunct and the population in Houston Co. may be relictual. Sorex arcticus occurred on the Great Plains during the Pleistocene (Stewart 1987; Wells and Stewart 1987). Extreme southeastern Minnesota was part of the Driftless Area, which included contiguous parts of Wisconsin, Iowa, and Illinois and which is general- ly recognized as having been free of the late Wisconsin ice sheet (, Mickelson et al. 1983). Sorex arcticus is documented from the late Pleistocene Driftless Area of Wisconsin (Foley 1984). This region is known for other relict species, including, for example, an assemblage of land snails (Frest 1991). It has been suggested (Rand 1954; Youngman 1975; Junge et al. 1983) that S. arcticus has expanded its range northward into Canada since glacial retreat. If so, one explanation of the relict population in southeastern Minnesota is that the range there may have been continuous with that of more northerly populations until the species disappeared from what is now the interven- ing hiatus during a Holocene warming period (Dorale et al. 1992). This specimen is Science Museum of Minnesota (SMM) number Z82:1:10. Acknowledgments We thank the Minnesota Department of Parks and Recreation for a permit to trap in Beaver Creek Valley State Park, R. J. Oehlenschlager for help in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-
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