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The pigmy woodrat, _Neotoma goldmani_ Merriam, the smallest known member of the genus, inhabits rocky areas in the elevated desert regions of the northern part of the Mexican Plateau (Mesa del Norte).
Goldman (N. Amer. Fauna, 31:82, October 10, 1910) had for study ten specimens from two localities in Coahuila. Since his report, Dalquest (Louisiana State Univ. Studies, Biol. Sci. Ser. No. 1:162, December 28, 1953) extended the known distribution of this species approximately 225 miles southward into San Luis Potosí, where he reported animals from five localities. Field workers from the Museum of Natural History at the University of Kansas recently have taken _goldmani_ in the Mexican states of Chihuahua, Coahuila, Durango, Zacatecas and San Luis Potosí, and now we can define, with greater accuracy, the geographic range of this species (see fig. 1 and list of specimens examined).