KEY 
TO 
North Americain Birds. 
CONTAINING A CONCISE ACCOUNT OF EVERY SPECIES OF LIVING AND FOSSIL 
BIRD AT PRESENT KNOWN FROM THE CONTINENT NORTH OF 
THE MEXICAN AND UNITED STATES BOUNDARY, 
INCLUSIVE OF GREENLAND. 
SecontJ fEfiitiort, i^cbtsci to ©ate, anli lEnttrelg i^tbiritten: 
WITH WHICH ARE INCORPORATED 
GENERAL ORNITHOLOGY: 
AN OUTLINE OF THE STRUCTURE AND CLASSIFICATION OF BIRDS; 
AND 
FIELD ORNITHOLOGY: 
A MANUAL OF COLLECTING, PREPARING, AND PRESERVING BIRDS. 
By ELLIOTT COUES, M.A., M.D., Ph.D., 
MEMBER OF THE NATIONAL ACADEMY OF SCIENCES, ETC., ETC. 
PROFUSELY ILLUSTRATED. 
BOSTON: 
ESTES AND LAURIAT, 
1884. 
