MILLER AND REHNr NORTH AMERICAN MAMMALS. 95 



Genus ZYGODONTOMYS Allen. 



1897. Zygodontomys ALLEN, Bull. Amer. mus. nat. hist., ix, p. 

 38. March 11, 1897. Type. Oryzomys cherriei ALLEN. 



Zygodontomys cherriei (Allen). 



1895. Oryzomys 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. tfigmodontomys ALLEN, Bull. Amer. mus. nat. hist., ix, 

 p. 38. March 11, 1897. Type. tfigmodontomys alfari ALLEN. 



Sigmodontomys alfari Allen. 



1897. Sigmodontomys alfari ALLEN, Bull. Amer. mus. nat. 



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

 TYPE LOCALITY. Jimenez, Costa Rica. Altitude, 700 feet. 



Genus REITHRODONTOMYS Giglioli .- 1 



1873. Reithrodontomys 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 Allen in 1895 (Bull. Amer. mus. nat. hist., vn, 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. 



