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 species was obtained on July 31, 1896, at Sierra Encarnacion, Coahuila, by Nelson and Goldman. We know of no specimens of this subspecies from Sierra Encarnacion, Nuevo Leon, and assume that Osgood referred to the Coahuilan specimen. Further support for this assumption is Osgood's (_loc. cit._) note that the Sierra Encarnacion specimen is aberrant and, to our eye, so is No. 79614 from Coahuila. ~Peromyscus merriami merriami~ Mearns