. The Canadian field-naturalist. 1987 BURNS: Northern Pocket Gopher in Southwestern Alberta 421. CANADA Figure 1. Location of fossil and recent occurrences of Thomomys talpoides in Alberta mentioned in text. Stippled area denotes recent distribution in Alberta of two subspecies of T. talpoides (after MacDonald 1969). Fossil sites (stars): A — January Cave; B — Eagle Cave. New recent records (black dots): 1 — Barrier Lake; 2 — Upper reaches of Sheep River; 3 — four sites near Hailstone Butte; 4 — West flank of Plateau Mountain; 5 — Indian Grave campground; 6 — Oldman River campground. Sp
. The Canadian field-naturalist. 1987 BURNS: Northern Pocket Gopher in Southwestern Alberta 421. CANADA Figure 1. Location of fossil and recent occurrences of Thomomys talpoides in Alberta mentioned in text. Stippled area denotes recent distribution in Alberta of two subspecies of T. talpoides (after MacDonald 1969). Fossil sites (stars): A — January Cave; B — Eagle Cave. New recent records (black dots): 1 — Barrier Lake; 2 — Upper reaches of Sheep River; 3 — four sites near Hailstone Butte; 4 — West flank of Plateau Mountain; 5 — Indian Grave campground; 6 — Oldman River campground. Specimens preserved in collections of the Provincial Museum of Alberta and the University of Alberta (Zoology) are denoted by "S". resolved through study of the fossils. Soper (1964) noted that T. talpoides cognatus in Alberta is probably a recent immigrant from British Columbia where it inhabits a restricted range (Cowan and Guiget 1965). There is no evidence to date that the ranges of T. t. cognatus and T. t. talpoides (the adjacent race in Alberta) have overlapped. The great variability in skull size and shape among the races of 77io/77om>'5(Dalquest and Scheffer 1944; Miller 1964) renders subspecific identification of the cave fossils impossible. Acknowledgments I thank Michael C. Wilson, University of Lethbridge, Lethbridge, Alberta, for stimulating discussions of gopher biogeography and for permitting me to use his unpublished observations. Michael J. Dorrance, Alberta Department of Agriculture, Edmonton, Alberta, very kindly shared his knowledge of earlier historical distributional records. The pollen analysis of January Cave is unpublished data in my dissertation and was kindly provided by J. H. McAndrews, Curator of Botany, Royal Ontario Museum, Toronto. M. C. Wilson, H. C. Smith, D. B. Schowalter, P. M. Youngman, and two anonymous referees reviewed and improved the manuscript with their suggestions. This is contribution No. 83 of the Natural
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