INTRODUCTION. 



The present " Catalogue of North American Birds'' has been reprinted, 

 with some changes, from the one in quarto, forming a portion of the 

 report on North American Birds, in Vol. IX. of the Reports of the Pacific 

 Railroad Survey, and published as a separate paper, by the Institution, in 

 October, 1858. Its object is to facilitate the labei.ij^ of the specimens of 

 birds and eggs in the Museum of the Institution, as also to serve the pur- 

 poses of a check list of the species. 



Copies printed on one side of the paper only, for labelling, or on both 

 sides, for miscellaneous purposes, will be furnished to institutions and indi- 

 viduals on application. 



JOSEPH^BENRY, . 

 Secretary S. I. 



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