1959. _Peromyscus difficilis petricola_ Hoffmeister and de
la Torre, Proc. Biol. Soc. Washington, 72:167, November 4,
type from 12 mi. E San Antonio de las Alazanas, 9000 ft.,
Coahuila.
_Distribution in Tamaulipas._--Westernmost part of state.
The three specimens from Miquihuana were collected among rocks and
stumps, in an oak forest. The specimens from 20 miles north of Tula
were collected after midnight on a hillside covered mainly with juniper
brush. A female (October 11) carried 3 embryos 26 mm. in crown-rump
length.
_Records of occurrence._--Specimens examined, 6: Miquihuana,
8500 ft., 3; 20 mi. N Tula, 5800 ft., 3.
=Peromyscus ochraventer= Baker