UNITED STATES AND MEXICAN 



} 



UNDER THE OUDKR OF 



LIEUT. COL. W. H. EMORY, 



MAJOR FIRST CAVAtiRY, AND UNITED STATES COMMISSIONER. 



IR 



OF TH 



OUND ARY, 



BY 



SPENCER F. BAIRD, 



ASSISTANT SECRETARY OF THE SMITHSONIAN INSTITUTION. 



WITH NOTES BY THE NATURALISTS OF THE SURVEY 



1 



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