SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 



Bulletin 56 



MAMMALS OF THE MEXICAN BOUNDARY 

 OF THE UNITED STATES 



A DESCRIPTIVE CATALOGUE OF THE SPECIES OF MAM- 

 MALS OCCURRING IN THAT REGION; WITH A 

 GENERAL SUMMARY OF THE NATURAL 

 HISTORY, AND A LIST OF TREES 



EDGAR ALEXANDER MEARNS, M. D. 

 Major and Surgeon, U. S. Army 



PART I 



Families Didelphiidse to Muridae 







WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1907 



