Nesoryzomys indefessus (Thomas, 1899) . Ann. Mag. Nat. Hist., ser. 7, 4:280.

TYPE LOCALITY: Ecuador, Galapagos Archipelago, Santa Cruz Island, Academia Bay .

DISTRIBUTION: Santa Cruz, Baltra (= South Seymour), and Fernandina (= Narborough) islands.

SYNONYMS: narboroughi .

COMMENTS: Patton and Hafner (1983:539) recommended that indefessus, narboroughi, and swarthi are "best considered races of a single species, which differ primarily in pelage color." Their analyses sustain this conclusion with regard to indefessus and narboroughi but not the craniodental differentiation of N. swarthi . N. i. indefessus is probably extinct, none documented since 1934 (see Patton and Hafner, 1983). Populations of N. i. narboroughi on Fernandina Island, which lacks commensal Rattus and Mus, appear stable (see Patton and Hafner, 1983).