. Mammals of the Mexican boundary of the United States : a descriptive catalogue of the species of mammals occurring in that region; with a general summary of the natural history, and a list of trees . Mammals; Mammals; Trees; Trees; Natural history; Natural history. Fig. 110.—Sigmodon minimus. Skull, a, doesal view; &, ventral view; c, lateral view. General remarlcs.—The original description of this species, written in the field, was based on two skins and three skulls, together with several fragments, all from the tyjje-locality. At the present time thirteen additional skins from localit
. Mammals of the Mexican boundary of the United States : a descriptive catalogue of the species of mammals occurring in that region; with a general summary of the natural history, and a list of trees . Mammals; Mammals; Trees; Trees; Natural history; Natural history. Fig. 110.—Sigmodon minimus. Skull, a, doesal view; &, ventral view; c, lateral view. General remarlcs.—The original description of this species, written in the field, was based on two skins and three skulls, together with several fragments, all from the tyjje-locality. At the present time thirteen additional skins from localities farther west, beyond the Sail Luis Mountains, are before me. These, allowing for season, are darker in color and somewhat larger. Dr. J. A. Allen has given the measurements of two adult males, taken at San Bernardino Ranch (Monument No. 77), by Mr. B. C. Condit, and these agree very closely with the dimensions of our specimens from the Santa Cruz Valley, near Monument No. 111. As the type of Sigmodon minimus was obtained at the western edge of the Eastern Desert, it is possible, should its range be found to extend into the center of that tract, that the larger and darker central form may require separation as a geo- graphical race, with the Elevated Central Tract for its habitat. The typical form in that case would be restricted to the Eastern Desert Tract. For comparison with the type and topotypes of Sigmodon minimus, two adults, male and female, taken at Igo's Ranch, at the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mearns, Edgar Alexander, 1856-1916. Washington : Govt. Print. Off.
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Keywords: ., bookcentury1900, bookdecade1900, books, booksubjectnaturalhistory
