Peromyscus nasutus J. A. Allen 1891

Wilson, Don E. & Reeder, DeeAnn, 2005, Order Rodentia - Family Cricetidae, Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2, Baltimore: The Johns Hopkins University Press, pp. 955-1189 : 1075

Peromyscus nasutus J. A. Allen 1891

Peromyscus nasutus J. A. Allen 1891 , Bull. Am. Mus . Nat. Hist., 3: 229.

Type Locality: USA, Colorado, Larimer Co., Estes Park.

Vernacular Names: Northern Rock Deermouse.

Synonyms: Peromyscus griseus Benson 1932 ; Peromyscus penicillatus Mearns 1896 .

Distribution: C Colorado and SE Utah, south through New Mexico and Trans-Pecos Texas, USA, to NW Coahuila, México.

Conservation: IUCN – Lower Risk (lc).

Discussion: P. truei species group. Considered a distinct species ( Osgood, 1909) until synonymized under P. difficilis by Hoffmeister and de la Torre (1961). Separated as a sibling species of P. difficilis by Zimmerman et al. (1975, 1978), as also recognized by Carleton (1989); however, the weak genic divergence persuaded Janecek (1990) to retain nasutus within P. difficilis . DeWalt et al. (1993 b) also uncovered low levels of genetic divergence among attwateri , difficilis , and nasutus (e.g., less than P. gratus versus P. truei ) but retained them as species, as did Tiemann-Boege et al. (2000) based on a broader survey of cytochrome b sequences among members of the boylii and truei species groups. Also see remarks under P. difficilis . Includes penicillatus , which Osgood (1909) had misclassified under P. boylii (see Diersing, 1976); distributional records in the Davis Mtns, W Texas, reviewed by Bradley et al. (1999 b).