K E Y 



TO 



NOHTII AMERICAN BIRDS 



CONTAISING A CONCISE ACCOUNT OF ErEEY Sl'ECIES OF 



LIYING ANT) FOSSIL BIllD 



AT PEESENT KNOWN" FROM THE CONTINENT NORTH OF THE MEXICAN 

 AND UNITED STATES BOUNDARY. 



ILLUSTRATED BY 6 STEEL PLATES, AND UPWARDS OF 250 WOODCUTS. 



BY 



/?, 





ELLIOTT COTLES, ^ 



ASSISTANT SlIRfiEON UNITED STATES A K M Y. f»Y^ V^*'' 



jcv ^ V 



€< 



^ 



s 



H^* 



Q;^ 





i^"^^ 



SALEM: NATURALISTS' AGENCY 



NEW YORK: DODD AND MEAD. 



BOSTON: ESTES AND LAURIAT. 



1872. 



