. Monographs of North American rodentia [microform]. Rodentia; Paleontology; Rongeurs; Paléontologie. "} i 1 m i m f !l:t i 1 '' -^J '- ' i â 1 1 'hi ,i I '1 j H , 1 1 t' ! ! i j â ^. ii ^- 388 MONOGKAl'IIS OF NOKTR AMERICAN RODENTIA. jjalate in Iljjstrix is broad and flat, and of uniform breadtii; in Erethizon it is narrowed anteriorly, and rises abruptly in front of the , and between the mohir series presents u prominent, central, ragged keel. Without going into a further comparison, it may suffice to stato that the structure of the sUull in the two forms differs markedly in nea
. Monographs of North American rodentia [microform]. Rodentia; Paleontology; Rongeurs; Paléontologie. "} i 1 m i m f !l:t i 1 '' -^J '- ' i â 1 1 'hi ,i I '1 j H , 1 1 t' ! ! i j â ^. ii ^- 388 MONOGKAl'IIS OF NOKTR AMERICAN RODENTIA. jjalate in Iljjstrix is broad and flat, and of uniform breadtii; in Erethizon it is narrowed anteriorly, and rises abruptly in front of the , and between the mohir series presents u prominent, central, ragged keel. Without going into a further comparison, it may suffice to stato that the structure of the sUull in the two forms differs markedly in nearly every detail. To the old Linnean genus Hystrix were for many years referred all the known Porcupines from both tlie Old and the New World. The group was iirst dismembered by M. F. Cuvier in 1822, who divided the Old World species into two groups, Hysfrix and Acanlh'wn,* and the New World species into three, Erethizon, Synetheres, and Sphinguius (" Sp/itggurus"). Brandt, in 1835, called special attention to the cranial differences characterizing the 01(1 World and New World species, and adopted Cuvier's genus Erethizon for the North American species, but united the two South American genera of Cuvier into the single genus Cercolabes, which groups have since been com- monly retained, with the limitations and names given by Brandt. Cercolabex, however, seems divisible into two generic groups, for which Cuvier's prior names should be retained.! Cho'tomys was established by Gray in 1843 for the Hystrix suhspi}wsa of earlier authors. ⢠The genus Erethizon is confined to the middle and northerly portions of the North American continent, and is represented by a single species, divisi- ble into two easily distinguished geographical varieties or subspecies. ERETHIZON DORSATUS (Linn.) F. Cuvier. Var. DORSATUS. Canada Porcupine. Hyatrix dortala Linn., Syst. Nat., e«I. x, i, 175tf, 07 | e,pi. clxix.âSluw, Gon. Zool. Miini., ii, 1801, 13, pi. cxxv.â Kuiii., BL'itrii
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