APPEIDIX C. 
LIST OF AUTHORITIES REFERRED TO IN THE PRECEDING REPORT. 
In the present appendix I have endeavored to furnish as complete a list as possible of the 
articles and works quoted in the preceding pages. This I have not been able to do from personal 
examination to so great an extent as in respect to the mammals, many titles, for want of time, 
being copied from Engelmann's Bibliotheca Historico-Naturalis, although the works were 
actually in the libraries of the Smithsonian Institution and of the Philadelphia Academy of 
Natural Sciences. 
The list is not given as a complete bibliography of ornithology, but only of works necessary 
to a proper understanding of the North American species ; and even in this connexion many 
titles on the generalities of the subject have been omitted as not actually referred to. The 
enumeration of particular papers on ornithology, entering into the question of synonymy, as pub- 
lished in the United States, is believed to be pretty full. 
A few titles quoted in the last hundred pages of the report will not be found in the list, as 
this was made up before the concluding manuscript of the volume was prepared. 
