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Title: Two New Meadow Mice from Michoacán Mexico
Author: E. Raymond Hall
Release Date: November 14, 2010 [EBook #34315]
Language: English
*** START OF THIS PROJECT GUTENBERG EBOOK TWO NEW MEADOW MICE FROM ***
Produced by Chris Curnow, Joseph Cooper, The Internet
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Two New Meadow Mice from Michoacán
Mexico
BY
E. RAYMOND HALL
University of Kansas Publications
Museum of Natural History
Volume 1, No. 21, pp. 423-427, 6 figs. in text
December 24, 1948
University of Kansas
LAWRENCE
1948
UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY
Editors: E. Raymond Hall, Chairman, A. Byron Leonard, Edward H. Taylor
Volume 1, No. 21, pp. 423-427, 6 figs. in text
December 24, 1948
UNIVERSITY OF KANSAS
Lawrence, Kansas
PRINTED BY
FERD VOILAND, JR., STATE PRINTER
TOPEKA, KANSAS
1948
22-3717
Two New Meadow Mice from Michoacán, Mexico
By
E. RAYMOND HALL
In preparing a list of kinds of mammals of which specimens have been
saved from the Méxican state of Michoacán, two heretofore unrecognized
subspecies of the Méxican meadow mouse, _Microtus mexicanus_, have been
found. Names for these and descriptions are given below.
#Microtus mexicanus fundatus# new subspecies
_Type._--Male, adult, skin and skull; No. 100637, Univ.
California Mus. Vert. Zool.; 3-1/2 mi. S Pátzcuaro, 7,900 ft.,
Michoacán, México; March 9, 1943; obtained by E. R. Hall,
original no. 5882.
_Range._--Known only from the vicinity of the type locality.
_Diagnosis._--Size large (see measurements); color brown
overlain with cinnamon; nasals expanded distally with
premaxillary borders concave laterally; posterior border of
orbit inclined posterolaterally; preorbital region and
interparietal region depressed; incisive foramina narrow;
zygomatic arches parallel; tympanic bullae much inflated.
_Comparisons._--Among named subspecies of _Microtus mexicanus_,
_M. m. fundatus_ most closely resembles _M. m. mexicanus_ but
differs as follows: Larger in all parts measured; pelage with
slightly less buffy color and with the buffy color that is
present of a slightly lighter tint; posterior two-thirds of
premaxillary border of each nasal concave rather than straight;
posterior border of orbit forming more acute angle with sagittal
plane of posterior part of skull; superior outline of nasals
straight rather than depressed in posterior part; tympanic
bullae more inflated both in vertical and horizontal planes.
From _M. c. salvus_, the subspecies next to the westward,
_fundatus_ differs as follows: Averaging larger in all parts
measured; less reddish on upper parts; underparts with more
reddish color but the reddish of lighter tint; perineal region
buffy instead of plumbeous; nasals with premaxillary borders
laterally concave rather than straight; superior outline of
skull with nasal segment sloping anteroventrally and
interparietal segment sloping posteroventrally rather than
straight; posterior margin of orbit inclined posterolaterally
thus forming an acute angle, instead of a right angle, with
sagittal plane of braincase; zygomatic arches parallel rather
than bowed outward; incisive foramina narrower; tympanic bullae
more inflated in vertical plane.
Relying on Bailey's (N. Amer. Fauna, 17:55, 1900) description of
_Microtus fulviventer_, _fundatus_ differs in much larger
tympanic bullae.
_Remarks._--The series of 59 specimens includes individuals of several
ages of both sexes. This has been a great advantage in making
comparisons with individuals of geographically adjoining subspecies
since individuals of the same age and sex could be compared. When the
skulls are laid top-side down on a flat surface the occiput is much
higher than in _salvus_.
Our specimens, taken in the dry season, were trapped mostly in runways
beneath a dense growth of grass underneath a rail fence.
_Specimens examined._--Total, 59, distributed, with respect to
the town of Pátzcuaro, as follows: 3-1/2 mi. S, 7,900 ft., 9;
4 mi. S, 7,800 ft., 16; 5 mi. S, 7,800 ft., 26; 9 mi. SE, 8,000
ft., 8.
[Illustration: FIGS. 1-6. Skulls of the type specimens of two
subspecies of _Microtus mexicanus_. XI.
FIGS. 1-3. _Microtus mexicanus fundatus._
FIGS. 4-6. _Microtus mexicanus salvus._]
#Microtus mexicanus salvus# new subspecies
_Type._--Female, adult, skin and skull; No. 52099, Chicago
Natural History Museum; Mount Tancitaro, 11,400 ft., Michoacán,
México; July 19, 1941; obtained by F. C. Wonder, original No.
1163.
_Range._--Known only from Mount Tancitaro at elevations of 7,800
to 11,400 feet.
_Diagnosis._--Size medium (see measurements); color brown
overlain with cinnamon; premaxillary borders of nasals straight;
superior outline of skull nearly straight; posterior margin of
orbit at right angle with long axis of skull; zygomatic arches
bowed outward; incisive foramina wide; tympanic bullae small.
_Comparisons._--From topotypes of its nearest relative,
_Microtus mexicanus phaeus_ Merriam, _salvus_ differs as
follows: Tail shorter; pelage with slightly more buffy (reddish)
pigment which, nevertheless, is of a lighter tint; premaxillary
borders of nasals straight rather than concave; superior outline
of skull more nearly straight (less convex); inferior border of
rostrum more nearly straight (less concave distally); palatal
fossae uniformly shallower.
Comparison with _M. m. fundatus_ is made in the account of that
subspecies.
_Remarks._--The degree of difference between _M. m. salvus_ and _M. m.
fundatus_ exceeds that between _M. m. salvus_ and _M. m. phaeus_ or that
between _M. m. fundatus_ and _M. m. mexicanus_.
_Specimens examined._--Total, 14, from Mount Tancitaro,
Michoacán, distributed, according to elevation above sea level,
as follows: 11,400 feet, 8; 11,000 ft., 2; 7,800 ft., 1; no
elevation recorded, 8.
_Measurements of the two subspecies._--Average and extreme
measurements of ten adult males of _M. m. fundatus_ and eight
adult males of _M. m. salvus_, are, respectively, as follows:
Total length, 147 (135-158), 141 (134-146); length of tail, 33.4
(30-39), 29.6 (25-32); length of hind foot, 21.1 (20-22), 20.0
(18-21); condylobasal length, 27.7 (27.0-29.0), 25.9
(25.5-26.2); occipitonasal length, 27.5 (26.8-28.5), 25.7
(25.3-26.0); length of nasals, 8.0 (7.7-8.4), 7.5 (6.9-8.1);
zygomatic breadth, 16.4 (15.9-17.2), 15.0 (14.6-15.3);
interorbital breadth, 3.7 (3.5-3.9), 3.5 (3.3-3.6); mastoid
breadth, 12.7 (12.2-13.2), 11.7 (11.7-11.7); alveolar length of
upper molar series, 7.0 (6.8-7.3), 6.7 (6.5-6.9); width of
rostrum, 5.7 (5.1-5.9), 5.3 (5.3-5.3); palatilar length, 13.3
(12.7-14.3), 12.6 (11.9-12.9). Of _M. m. salvus_ only two
specimens yield data for the first, second, sixth and eighth
cranial measurements named above.
For the loan of comparative material I am grateful to Dr. Hartley H. T.
Jackson and Mr. Stanley P. Young of the Biological Surveys Collection in
the United States National Museum, Messrs. Karl P. Schmidt and Collin C.
Sanborn of the Chicago Natural History Museum, and for assistance with
the field work to the John Simon Guggenheim Memorial Foundation and to
Miss Annie M. Alexander.
_Transmitted June 1, 1948._
22-3717
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