tus). Proc. Roy. Soc. London, Ser. B. 134:5256. MARTOF, B. S. AND R. L. HUMPHRIES. 1959. Geographic variation in the wood frog, Rana sylvatica. Am. Midi. Nat. 61:350-389. MCANDREWS, J. H. 1967. Pollen analysis and vegetational history of the Itasca Region, Minnesota. In: Quaternary paleoecology. E. J. Gushing and H. E. Wright, Jr. eds., pp. 216236. Yale Univ. Press, New Haven, Conn. MERRELL, D. J. 1965. The distribution of the dominant Burnsi gene in the leopard frog, Rana pipiens. Evolution 19:69-85. MORIWAKI, T. 1953. The inheritance of the dorsal-median stripe in Rana limnocharis Wiegmann. J. Sci. Hiroshima Univ. Ser. B., Div. 1, 14:159-164. MORIYA, K. 1952. Genetical study of the pond frog, Rana nigromaculata. I. Two types of Rana nigromaculata found in Tokato District. J. Sci. Hiroshima Univ. Ser. B., Div. 1, 13:189197. PORTER, K. R. 1969. Evolutionary status of the Rocky Mountain population of wood frogs. Evolution 23:163-170. PYBURN, W. F. 1961. The inheritance and diss). Proc. Roy. Soc. Lond , Ser. B. 134:52. tribution of vertebral stripe color in the cricket frog. In: Vertebrate speciation. W. Frank Blair, ed., pp. 235-261. Univ. Tex. Press, Austin, Tex. SIMPSON, G. G., A. ROE AND R. C. LEWONTIN. 1960. Quantitative zoology. Harcourt, Brace and World, Inc., New York. WALKER, C. F. 1946. The amphibians of Ohio. Part 1. Frogs and toads. Ohio State Mus. Bull. 1 (3):93-102. WAYNE, W. J. 1967. Periglacial features and climatic gradient in Illinois, Indiana, and western Ohio, east-central United States. In: Quaternary paleoecology. E. J. Gushing and H. E. Wright, Jr. eds., pp. 393-414. Yale Univ. Press, New Haven, Conn. WRIGHT, H. E., JR. 1964. Aspects of the early postglacial forest succession in the Great Lakes Region. Ecology 45:439-448.
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Walter R. Courtenay (1971) studied this question.