The Project Gutenberg EBook of Subspeciation in the Meadow Mouse, Microtus
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Title: Subspeciation in the Meadow Mouse, Microtus pennsylvanicus, in Wyoming, Colorado, and Adjacent Areas
Author: Sydney Anderson
Release Date: July 19, 2010 [EBook #33204]
Language: English
Character set encoding: ASCII
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UNIVERSITY OF KANSAS PUBLICATIONS
MUSEUM OF NATURAL HISTORY
Volume 9, No. 4, pp. 85-104, 2 figs. in text
May 10, 1956
Subspeciation in the Meadow Mouse, Microtus pennsylvanicus,
in Wyoming, Colorado, and Adjacent Areas
BY
SYDNEY ANDERSON
UNIVERSITY OF KANSAS
LAWRENCE
1956
UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY
Editors: E. Raymond Hall, Chairman, A. Byron Leonard, Robert W. Wilson
Volume 9, No. 4, pp. 85-104, 2 figures in text
Published May 10, 1956
UNIVERSITY OF KANSAS
Lawrence, Kansas
PRINTED BY
FRED VOILAND, JR., STATE PRINTER
TOPEKA, KANSAS
1956
Subspeciation in the Meadow Mouse, Microtus pennsylvanicus,
in Wyoming, Colorado, and Adjacent Areas
BY
SYDNEY ANDERSON
INTRODUCTION
In the region including Wyoming and Colorado, _Microtus pennsylvanicus_
has been divided into two subspecies: the pale _M. p. insperatus_ (J.
A. Allen) inhabits the Black Hills of the northeasternmost part of
Wyoming; the dark _M. p. modestus_ (Baird) inhabits extensive areas
in both Wyoming and Colorado. Initial examination of _Microtus
pennsylvanicus_ revealed that specimens from the Big Horn Mountains of
north-central Wyoming (within the range of _modestus_ as mapped by Hall
and Cockrum 1952:407), in color at least, resemble the subspecies
_insperatus_ more than they do _modestus_, and that specimens from
southwestern Wyoming are notably dark. Durrant (1952:363) noted that
specimens from Utah are dark, and Davis (1939:315) did the same for
specimens from near Pocatello, Idaho. It seemed, therefore, that dark
color might cha
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