Mus triton (Thomas, 1909) . Ann. Mag. Nat. Hist., ser. 8, 4:548.

TYPE LOCALITY: Kenya, Mt Elgon, Kirui, 6000 ft .

DISTRIBUTION: N Zaire and E Zaire ( Kivu region), Uganda, Kenya, Tanzania, Malawi, Tete Dist. of Mozambique, Zambia, and Angola.

SYNONYMS: birungensis, fors, imatongensis, murilla, naivashae .

COMMENTS: Subgenus Nannomys . Listed as a questionable synonym of M. mahomet by Yalden et al. (1976:30) who were unsure about the equivalence of mahomet and triton and merely noted that Ethiopian samples previously identified as triton were really mahomet . The description of Mus birungensis (Lonnberg and Gyldenstolpe, 1925) mirrors the range of variation of M. triton in series (in the American Museum of Natural History) we have examinied from the Kivu region of E Zaire. Considerable chromosomal polymorphism has been reported in samples identified as M. triton (Robbins and Baker, 1978) . Extant southern limit of species is Zambia and Tete Dist. of Mozambique (about 17°S), but it was present in Natal, South Africa up to about 60,000 years ago (Avery, 1991).