Generic and Family Names of Rodents. 251 



Erethizon 1 F. Cuvier, 1822 Hystrix dorsata. 



Hystricops Leidy, 1858 Hystrix venustus. 



Oiiychura Brookes, 1828 Onychura spinosa. 



Plectrochoerus Pictet, 1843 ... Plectrochcerus moricandi. 



Sciamys Ameghino, 1887 Sciamys principalis, S. varians. 



Since therus 2 F. Cuvier, 1822. . . Hystrix prehensilis. 



Sphiggurus 3 F. Cuvier, 1822. . . Sphiggurus spinosus, 



Steiromys Ameghino, 1887. ...... Steiromys detentus, S. duplicatus. 



GEOMYIDAE. 



Geomyina BONAPARTE, Conspectus Syst. Mastozoologiae, 1850. 



Geomyinae BATED, Mamm. N. Am., pp. xxx, 366, 1857. 



Geomyidae GILL, Arrangement Fam. Mamm., p. 21, Nov., 1872. 

 + Pseudotomina GRAY, Thomson's Ann. Philos., XXVI, p. 342, 1825. 

 J Pseudostomidae GERVAIS, Ann. Sci. Nat., Paris, 3 e ser., XX, p. 245, 1853. 



Name, authority, and date. Type or included species. 



Ascomys Lichtenstein, 1825. . . Ascomys canadensis ( Mus bursa- 



rius). 



Cratogeomys Merriam, 1895. . . Geomys merriami. 

 Diplostoma Rafinesque, 1817. . Diplostoma fusca (= Mus bursarius). 



Geomys Rafinesque, 1817 Geomys pinetis (= Mus tuza Ord). 



Gymnoptychus Cope, 1873 Gymnoptychus chrysodon, G. nasutus, G. 



trilophus, and G. minutus. 



Heliscomys Cope, 1873 Heliscomys vetus. 



Heterogeomys Merriam, 1895. Geomys hispidus. 

 Macrogeomys Merriam, 1895. . Geomys heterodus. 

 Orthogeomys Merriam, 1895.. . Geomys scalops. 



Oryctomys Eydoux & Gervais, Five subgenera : Diplostoma, Sacco- 

 1836. phorus, Saccomys, Poephagomys, 



Ctenomys. 



Pappogeomys Merriam, 1895. . Geomys bulled. 

 Platygeomys Merriam, 1895. . . Geomys gymnurus. 



Pseudostoma Say, 1823 Pseudostoma bursaria. 



Saccophorus Kuhl, 1820 Mus bursarius. 



Thomomys Maximilian, 1839. . Thomomys rufescens. 



*?Tucanus Rafinesque, 1815 Nomen nudum? 



Zygogeomys Merriam, 1895. . . Zygogeomys trichopus. 



1 Emended to Erethison (Waterhouse, 1839); Eretison (McMurtrie,1831); 

 Eretizon (Cuvier, 1825) ; Erythizon (Alston, 1876). 



2 Emended to Sinetheres (Agassiz, 1842); Sinoetherus (Cuvier, 1825); 

 Syngetheres (Gervais, 1859) ; Synetheres (G. Cuvier, 1829) ; Synretheres 

 (Lund, 1839). 



3 Emended to Sphingurus (Waterhouse, 1848) ; Spiggurus (Gray, 1847) ; 

 Spigurus (Swainson, 1835) . 



