MILLER AND REHN: NORTH AMERICAN MAMMALS. 95 



Genus ZYG-ODONTOMYS Allen. 



1897. Zygodontomys Allen, Bull. Araer. mus. nat. hist., ix, p. 

 38. March 11, 1897. Type. — Ori/zomys cherrlei Allen. 



Zygodontomys cherriei (Allen). 



1895. Oryzoniys cherriei Allen, Bull. Amer. mus. nat. hist., 



VII, p. 329. November 8, 1895. 

 1897. Zygodontomys cherriei Allen, Bull. Amer. mus. nat. 



hist., IX, p. 38. March 11, 1897. 

 Type locality. — Boruca, Costa Rica. 



Genus SIGMODONTOMYS Allen. 



1897. Sigmodonto7nys Allen, Bull. Amer. mus. nat. hist., ix, 

 p. 38. March 11, 1897. Type.— iSigmodontomys alfari Allen. 



Sigmodontomys alfari Allen. 



1897. Sigrtwdont<)))iys aJf<(ri Allen, Bull. Amer. mus. nat. 



hist., IX, p. 39. March 11, 1897. 

 Type LOCALITY. — Jimenez, Costa Rica. Altitude, 700 feet. 



Genus REITHRODONTOMYS Giglioli.^ 



1873. Heithrodontomys Giglioli, Richerche intorno alia distrib. 

 geog. gener., p. 60. Type. — Reithrodon from North America 

 = Mus lecontii Audubon and Bachman. 



1 A synopsis was published by AUen inl«95(Bull. Amer. mus. nat. hist., vii, pp. 

 107-143, May 21, 1895), but the subsequent increase of nearly 100 per cent in the number 

 of known forms makes it necessary to treat the genus as not revised. 



