Archive image from page 11 of Description of fourteen new species. Description of fourteen new species and one new genus of North American mammals descriptionoffou02merr Year: 1889 4 NORTH AMERICAN FAUNA. [No. 2. Lower molar series much broader than in Hesperomys. First lower molar with an anterior, two internal, and two external cusps, and a postero internal loop. In Hesperomys the anterior cusp is divided, so that there are three distinct cusps on each side. Second lower molar with two internal and two external cusps, an antero-external and a pos- tero-internal fold. Third lower molar scarc
Archive image from page 11 of Description of fourteen new species. Description of fourteen new species and one new genus of North American mammals descriptionoffou02merr Year: 1889 4 NORTH AMERICAN FAUNA. [No. 2. Lower molar series much broader than in Hesperomys. First lower molar with an anterior, two internal, and two external cusps, and a postero internal loop. In Hesperomys the anterior cusp is divided, so that there are three distinct cusps on each side. Second lower molar with two internal and two external cusps, an antero-external and a pos- tero-internal fold. Third lower molar scarcely longer than broad, sub- circular in outline, with the large posterior lobe of Hesperomys reduced to a slight fold of enamel, which disappears with wear. Ooronoid process of mandible well developed, rising high above the condylar ramus and directed backward in the form of a large hook (see accompanying cut). Nasals wedge-shaped, terminating posteri- orly considerably behind the end of the nasal branch of the premaxil- laries. 1. Lower jaw of Onychomys leucogaster. 2. Lower jaw of Hesperomys leucopus. Body much stouter and heavier than in Hesperomys. Tail short, thick, and tapering to an obtuse point. Fore feet larger than in Hesperomys; five-tuberculate, as usual in the Murine series. Hind feet four-tuberculate, and densely furred from heel to tubercles. Tubercles phalangeal, corresponding to the four an- terior tubercles of Hesperomys, that is to say, the first is situated at the base of the first digit, the second at the base of the second digit) the third over the bases of the third and fourth digits together, the fourth at the base of the fifth digit. The fifth and sixth (or metatarsal) tubercles of Hesperomys are altogether wanting. C. SYNOPSIS OP SPECIES AND SUBSPECIES. (1) By External Characters. Length, about 150mm ; tail, about 40; bind foot, about 21; ear from crown, 10. Color above, mouse-gray; black ring around eye inconspicuous 0. leucogaster. Size of 0. leuc
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