Zapus Coues, 1875 . Bull. U.S. Geol. Geog. Surv. Terr., ser. 2, 5(3):253.

TYPE SPECIES: Dipus hudsonius Zimmermann, 1780 .

COMMENTS: Revised by Preble (1899) and Krutzsch (1954). Myology, in context of adaptive and phylogenetic significance, studied by Klingener (1964). Dental evolution investigated by Klingener (1963). For verification of the absence of cheek pouches in Zapus see Klingener (1971). Phallic morphology described by Shenbrot (1992).