Generic and Family Names' of Rodents. .251 



Brethizon^ F. Cuvier, 1822 Hystrix dorsata. 



Hystricops Leidy, 1858 Hystrix venustus. 



Onychura Brookes, 1828. Onychura spinosa. 



Plectrochcerus Pictet, 1843 Plectrochcerus moricandi. 



Sciamys Ameghino, 1887 Sciamys principalis, S. varians. 



SincBtherus^ F. Cuvier, 1822. . . Hystrix prehensilis. 



Sphiggurus^ F. Cuvier, 1822. . . Sphiggurus spinosus, 



Steiromys Ameghino, 1887 Steiromys detentus, S. duplicatus. 



GEOMYIDAE. 



Geomyina Bonaparte, Conspectus Syst. Mastozoologise, 1850. 

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

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

 JPseudotomina Gray, Thomson's Ann. Philos., XXVI, p. 342, 1825. 

 X PaeudostomidaB Gervals, Ann. Sci. Nat., Paris, 3''ser., XX, p. 245, 1853. 

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



Ascomys Lichtenstein, 182^. . . 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 bulleri. 

 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); 

 Syneetheres (Gervais, 1859) ; Synetheres (G. Cuvier, 1829) ; Syncetheres 

 (Lund, 1839). 



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

 Spigurus (Swainson, 1835). 



