Nelsonia Merriam, 1897 . Proc. Biol. Soc. Washington, 11:277.

TYPE SPECIES: Nelsonia neotomodon Merriam, 1897 .

COMMENTS: Neotomine. Revised by Hooper (1954) and recently by Engstrom et al. (1992), who resurrected goldmani as a species distinct from N. neotomodon . Viewed as a basal member of clade including Neotoma and related genera (Carleton, 1980; Hooper, 1954, 1960). Phylogenetic significance of banded karyotype discussed by Engstrom and Bickham (1983).