. 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. 107.—Pekomyscus tibueonensis. Skoil. a, dorsal view; 6, ventbal view; c, lateral VIEW. buUse are much less developed, and the incisive foramina and inter- pterygoid fossa wider. The teeth (fig. 108) are considerably smaller. Remurlcs.—This species was taken on Tiburon Island by Mr. J. W. Mitchell, who accompanied Doctor McGee
. 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. 107.—Pekomyscus tibueonensis. Skoil. a, dorsal view; 6, ventbal view; c, lateral VIEW. buUse are much less developed, and the incisive foramina and inter- pterygoid fossa wider. The teeth (fig. 108) are considerably smaller. Remurlcs.—This species was taken on Tiburon Island by Mr. J. W. Mitchell, who accompanied Doctor McGee, of the Bureau of Ethnology, on his exploration in the region inhabited by the Seri Indians during the season of 1895-96. Though occurring beyond the scope embraced by the present report, the species is here introduced for the purpose of completing the history of the desert mice that are closely related to Peromyscus eremicus. This insular form was evidently de- rived from P. eremicus of the adjacent mainland, from which it differs in being smaller, with a darker coloration, more hairy tail, and in having certain cranial peculiarities, described above. Fig. 108.—Peeomyscus ti- bueonensis. Ceowns of MOLAE TEETH. a, LOWEE SEEIES: 5, UPPER SERIES. Genus SIGMODON Say and Ord (182S). Sigmodan Sat and Oed, Joum. Acad. Nat. Sci. Phila., IV, Pt. 2,1825, p. 352. Dentition.—I. M. ; = i6. Type.—Sigmodan hispidus Say and Ord. Characters.—Form ratlike, with prominent ears and a somewhat hairy tail (fig. 109). Grinding teeth, with crowns flattened and divided into S-shaped loops formed by plates of hard enamel inclos- ing a softer substance (dentine); skull with a prominent supraorbital fronto-parietal 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 : Gov
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