Speciation and Evolution of the Pygmy Mice, Genus BaiomysPackard, Robert L. (Robert Lewis)
Science
Speciation and Evolution of the Pygmy Mice, Genus Baiomys
Packard, Robert L. (Robert Lewis)
Mice
_Comparisons._--For comparisons with _B. t. allex_, _B. t. canutus_, _B.
t. paulus_, and _B. t. fuliginatus_, see accounts of those subspecies.
From _B. t. taylori_, _B. t. analogous_ differs as follows: sides and
dorsum darker, differing most in freshly prepared specimens; dorsal
surface of forefeet and hind feet darker; basal part of hairs on belly
darker gray; frontal bones less constricted, causing less taper
anteriorly in interorbital space; interparietal wider transversely;
basioccipital more expanded laterally, narrowing more abruptly at suture
between basioccipital and basisphenoid.
_Remarks._--The pelage of _analogous_ becomes paler with wear as pointed
out by Osgood (1909:257). A paratype, U. S. Nat. Mus. 120260, and
several specimens from 1 mi. S, 11 mi. W Zamora, Michoacan, are grayish
rather than brownish-black. All of these are old adults having the
terminal black parts of the hairs on the dorsum nearly worn away.
Excluding such grayish individuals, _B. t. analogous_, like _B. t.
subater_ and _B. t. fuliginatus_, is uniformly brownish-black. Both
_analogous_ and _fuliginatus_ occur in relatively high mountainous
country on dark soils or pedregals, and all three of the aforementioned
subspecies occur in zones of high relative humidity.
_B. t. analogous_ intergrades with _B. t. paulus_ (see account of that
subspecies) and _B. t. allex_ south and west of Lago de Chapala in
Jalisco. Additional specimens are needed from Queretaro and San Luis
Potosi in order to ascertain whether or not _B. t. analogous_
intergrades with _B. t. fuliginatus_ or _B. t. taylori_. Specimens from
western Jalisco, in the past referred to _B. t. analogous_, are
referable to _B. t. allex_ (see account of that subspecies). Specimens
obtained west of, and bordering, the Rio del Naranjo in Jalisco show a
mixture of characters of both _B. t. allex_ and _B. t. analogous_. For
example, specimens from 2 mi. N Ciudad Guzman resemble _analogous_ on
the dorsum, whereas, on the belly, the individual hairs are
white-tipped, pale gray at the base, and in over-all appearance are
whitish-gray, unlike typical _analogous_ (being like _allex_ instead).
The dorsal surface of the forefeet are sooty to light brownish (as in
_analogous_), whereas, the hind feet are flesh-colored (as in _allex_).
Another series of specimens from 4 mi. W Leon, Guanajuato, are
intergrades between _B. t. analogous_ and _B. t. paulus_. These
specimens are grayish to brownish on the dorsum, have sooty forefeet and
hind feet (more nearly as in _analogous_ than in _paulus_), are
grayish-white on the venter, and have a distinctly bicolored tail
(resembling that of _paulus_ more than that of _analogous_). When the
average of cranial characters is considered, both series are best
referred to _analogous_.
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