Pseudomys occidentalis Tate, 1951 . Bull. Am. Mus. Nat. Hist., 97:246.

TYPE LOCALITY: Australia, Western Australia, Tambellup .

DISTRIBUTION: Australia; extant range in SW Western Australia, subfossil specimens indicate species extended along S coastline to Kangaroo Isl off coast of South Australia (see map and discussion in Watts and Aslin, 1981:205).

STATUS: U.S. ESA - Endangered; IUCN - Rare.

COMMENTS: Considered "rare and likely to become extinct," but range was contracting before arrival of Europeans (Watts and Aslin, 1981:205). Electrophoretic data clustered P. occidentalis with all other Pseudomys analyzed except P. fumeus, P. gracilicaudatus, P. nanus, and P. shortridgei (Baverstock et al., 1981) .