Generic and Family Names of Rodents. 269 



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



Addomys Gervais, 1853 Theridomys vaillanti. (See Pseudosciuridx.} 



Archxomys Laizer & Parieu, 1839. New name for Palxomys Lai/,. & Par. 



Blainv'dlimys (Bravard MS.) Ger 

 vais, 1848-'52 Theridomys blainvillei. 



Cournomys (Croizet) Zittel, 1893. Synonym of Issidioromys. 



Cavierimys Bravard, 1848-' 52. . . . Cuvierimys laurillardi. 



Dipoides Jiiger, 1835 Species not named. 



Gergoviomys (Croizet MS.) Blain- 

 ville, 1840 Species not named. 



* Jsoptychus Pomel, 1854 Theridomys (Isoptychus) jourdani, Isop- 



tychus auberyi, I. antiquus, I. cuvieri, 

 I. vassoni, TJieridomys aqaatilis (?). 

 Issidioromys (Croizet MS.) Blain- 



ville, 1840 Issidioromys pseudansema Gervais, 1848, 



f Neomys Bravard, 1844 Neomys lembronicus (= Theridomys 



lembronicus). 

 Nesokerodon Schlosser, 1884 Isiodoromys minor. 



* Omegodus Pomel, 1854 Omegodus echimyo'ides. 



* Palanxma Pomel, 1854 Palansema antiquus. 



t Palxomys Laizer & Parieu, 1839. . Palxomys arvernensis. (See Archxomys.) 



* Perrieromys Croizet (?) 



Protechimys Schlosser, 1884 Protechimys gracilis, P. major. 



*~\Txniodus Pomel, 1854 EcMmys curvistriatus. 



Theridomys Jourdan, 1837 Species not named in first description. 



Trechomys Lartet, 1869 Trechomys bonduellii. 



INCERTJE SEDIS. 



Anotis Rafmesqne, 1815 Nomen nudurn. 



Archilagus Hseckel, 1895 Hypothetical genus 'Atavns omnium 



Rodentium.' 



Asteromys 1 Ameghino, 1897 Asteromys puncius, A. prospicuus. 



JSMdornysC Croizet') Bravard, 1843 Nomen nuduin. 



Cephalomys 1 Ameghino, 1897.. . . Cephalomys arcidens, C. plexus. 



Haplostropha Ameghino, 1891 . . . Haplostropha scalabriniana. 



Hystriocomys Giebel, 1860 Hystriocomys thuringiacus. 



? Mixodectes"* Cope, 1883 Mixodectes pungens, M. crassiculus. 



Orchiomys 1 Ameghino, 1897 Orchiomys prostans. 



1 Cephalomyidse, Ameghino, Bol. Inst. Geog. Argentine, XVIII, p. 592, 

 Oct. 6, 1897. 



2 Mixodectidx Cope, Proc. Acad. Nat. Sci. Phila., p. 80, May 22, 1883. 



" The discovery of some skeleton fragments in good association with a 

 lower jaw of Mixodectus pungens makes it probable that this genus should 

 be removed from the Primates and placed as an extremely primitive Ro 

 dent." Matthew, Bull. Am. Mus. Nat. Hist. New York, IX, p. 265,1897. 



60 BIOL. Soc. WASH., VOL. XI, 1897. 



