The distribution of Transandinomys extends from eastern Honduras through Nicaragua, Costa Rica, Panama, and Colombia south and east to southwestern Ecuador and northern Venezuela, generally west and north of the Andes.Weksler et al., 2006, p. 24; Musser et al., 1998, p. 113 The ranges of the two species overlap but are distinct. T. bolivaris occurs from Honduras mainly on the Caribbean side of Central America south to western Colombia and northwestern Ecuador, up to 1800 m (5900 ft) above sea level.Musser et al., 1998, p. 113 T. talamancae, which is found up to 1525 m (5000 ft) above sea level, is less widely distributed in Central America, as it is not known further north than northwestern Costa Rica, but is more widely distributed in South America, occurring into far southwestern Ecuador and northern Venezuela. It has also been recorded south of the Venezuelan Andes, in the narrow strip of forest between the Llanos and the mountains.Musser et al., 1998, p. 157; Musser and Carleton, 2005, p. 1255 Both species are forest rats, but whereas T. bolivaris is restricted to humid forest formations, T. talamancae apparently is more tolerant of drier forest, which explains its wider South American distribution.Musser et al., 1998, p. 157; Weksler et al., 2006, p. 24
