Order Rodentia - Family Muridae Author Guy G. Musser Author Michael D. Carleton text 1993 Smithsonian Institution Press Washington and London Editor Don E. Wilson Editor DeeAnn M. Reeder Mammal Species of the World (2 nd Edition) 501 755 book chapter http://doi.org/10.5281/zenodo.7353098 1-56098-217-9 7353098 Peromyscus nasutus (J. A. Allen, 1891) . Bull. Amer. Mus. Nat. Hist., 3:229 . TYPE LOCALITY: USA , Colorado , Latimer Co., Estes Park . DISTRIBUTION: C Colorado and SE Utah , south through New Mexico and Transpecos, Texas , USA , to NW Coahuila , Mexico . SYNONYMS: griseus , penicillatus . COMMENTS: Considered a distinct species ( Osgood, 1909 ) until synonymized under P. difficilis by Hoffmeister and de la Torre (1961) . Recognized as a sibling species separate from P. difficilis by Zimmerman et al. (1975 , 1978 ). Includes penicillatus , which Osgood (1909) had misclassified under P. boylii (see Diersing, 1976 ). P. truei species group.