Tylomys Peters, 1866 . Monatsb. K. Preuss. Akad. Wiss. Berlin, 1866:404.

TYPE SPECIES: Hesperomys nudicaudus Peters, 1866 .

COMMENTS: Tribal-level membership unresolved; closely related to Ototylomys (see remarks under same). Basic revision much needed; forms listed follow Hall (1981:626), who remarked that "study...may show that some of the species are only subspecies."