Aconaemys fuscus (Waterhouse, 1842) . Proc. Zool. Soc. Lond., 1841:91 [1842].

TYPE LOCALITY: Argentina, Mendoza Prov., Valle de las Cuevas; see comments .

DISTRIBUTION: High Andes of Chile and Argentina (between 33° and 41°S).

STATUS: Locally abundant.

SYNONYMS: porteri.

COMMENTS: Waterhouse never designated a type species, which was finally designated as a lectotype by Thomas (1917a). Waterhouse's original type locality was "from Chile ", but in 1848 he added that the locality was from the Valle de las Cuevas near the Volcano of Peteroa, which would make the locality in Argentina (Pearson, 1984). These complications make it difficult to evaluate the status of the following species. The chromosome no. is 2n=56.