Mus bufo (Thomas, 1906) . Ann. Mag. Nat. Hist., ser. 7, 18: 145.

TYPE LOCALITY: Uganda, Ruwenzori East, 6000 ft .

DISTRIBUTION: E Zaire ( Kivu region), adjacent Uganda, Rwanda, and Burundi; a montane Western Rift endemic.

SYNONYMS: ablutus, wambutti.

COMMENTS: Subgenus Nannomys . In body size and morphology, M. bufo superficially resembles the large-bodied M. triton, but the two are distinguished by dental features and tail length (Petter and Matthey, 1975) as well as karyotypes (Robbins and Baker, 1978), and both occur together in the Kivu region of E Zaire (specimens in the American Museum of Natural History). Chromosomal data for Burundi samples reported by Maddalena et al. (1989).