mentioning this specimen that, on geographic grounds, might be either
_D. a. martirensis_ or _D. a. simulans_. Certain measurements of the
specimen are as follows: Total length, 288; length of tail, 171; length
of hind foot (dry), 41.0; greatest length of skull, 39.5; width of
maxillary arch at middle, 4.5. The long tail and wide (4.5) maxillary
arch are characteristic of _Dipodomys agilis simulans_ and constitute
the basis for identifying the specimen as of that subspecies.

~Baiomys taylori analogus~ Osgood

The geographic range currently assigned to _Baiomys taylori paulus_ (J.
A. Allen) is separated in two parts by the geographic range assigned to
_B. t. analogus_. The southern, separated part of the range of _B. t.
paulus_ rests wholly on ten specimens from Colima, Colima, identified as
_B. t. paulus_ by Osgood in his "Revision of the mice of the American
genus Peromyscus" (N. Amer. Fauna, 28, April 17, 1909) where (p. 255) he
places as a synonym of _Peromyscus taylori paulus_ J. A. Allen, 1903,
_Peromyscus allex_ Osgood, 1904. The later name was based on these ten
specimens (33422/45445-33427/45450, 33429/45452, 33432/45455, and
33435/45458 BS) from Colima. Osgood had a choice of synonymizing _P.
allex_ under _P. paulus_ or _P. t. analogus_. According to Osgood's
concept, _analogus_ was blackish and large; _allex_ was grayish and
small; and _paulus_ was fawn colored and intermediate in size. The more
nearly equal size of _paulus_ and _allex_ probably influenced Osgood in
making his choice. After examining the original materials we think there
is more to recommend the alternate choice. For example, two topotypes
of equal age of the same sex of _allex_ (33424/45447) and _analogus_
(120264 BS) are of almost the same size and, respectively, measure as
follows: Total length, 107, 108; length of tail, 42, 45; length of hind
foot (measured dry), 13.1, 12.8; greatest length of skull, 17.6, 17.7;
zygomatic breadth, 9.3, 9.2. Although _analogus_ does average darker, a
topotype, No. 120267 BS, from Zamora, is indistinguishable from several
of the topotypes of _allex_. Consequently, we arrange _Peromyscus allex_
Osgood as a synonym of _Baiomys taylori analogus_ (Osgood) 1909 and
refer the specimens from Colima to the latter.

~Peromyscus eremicus eremicus~ (Baird)

Osgood (N. Amer. Fauna, 28:242, April 17, 1909) listed a specimen of
this subspecies from Sierra Encarnacion, Nuevo Leon. A specimen, No.
79614 BS, of this