The Project Gutenberg EBook of Subspeciation in the Meadow Mouse, Microtus
pennsylvanicus, in Wyoming, Colorado, and Adjacent Areas, by Sydney Anderson

This eBook is for the use of anyone anywhere at no cost and with
almost no restrictions whatsoever. You may copy it, give it away or
re-use it under the terms of the Project Gutenberg License included
with this eBook or online at www.gutenberg.org

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

*** START OF THIS PROJECT GUTENBERG EBOOK SUBSPECIATION IN THE MEADOW MOUSE ***

Produced by Chris Curnow, Joseph Cooper and the Online
Distributed Proofreading Team at http://www.pgdp.net

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