Baiomys musculus (Merriam 1892)
[Baiomys] musculus (Merriam 1892), Proc. Biol. Soc. Wash., 7: 170.
Type Locality: México, Colima, Colima.
Vernacular Names: Southern Pygmy Mouse.
Synonyms: Baiomys brunneus (J. A. Allen and Chapman 1897); Baiomys grisescens Goldman 1932; Baiomys handleyi Packard 1958; Baiomys infernatis Hooper 1952; Baiomys nebulosus Goodwin 1959; Baiomys nigrescens (Osgood 1904); Baiomys pallidus Russell 1952; Baiomys pullus Packard 1958 .
Distribution: SW Nayarit and C Veracruz, México, to NW Nicaragua, excluding Yucatán Peninsula and Caribbean tropical lowlands.
Conservation: IUCN – Lower Risk (lc).
Discussion: See Packard and Montgomery (1978, Mammalian Species, 102).