Peromyscus gratus Merriam, 1898 . Proc. Biol. Soc. Washington, 12:123.

TYPE LOCALITY: Mexico, Distrito Federal, Tlalpan .

DISTRIBUTION: SW New Mexico, USA, south from W Chihuahua and SE Coahuila, through interior Mexico to C Oaxaca.

SYNONYMS: erasmus, gentilis, pavidus, zapotecae, zelotes .

COMMENTS: Mexican populations revised, as part of P. truei, by Hoffmeister (1951). Divergent karyotypes and genetic distances had questioned unity of P. truei (Lee et al., 1972; Zimmerman et al., 1978); sympatry documented in New Mexico by Modi and Lee (1984), who raised P. gratus to a species (also see Janecek, 1990). P. truei species group.