ACKNOWLEDGMENTS. 



My thanks are due to the United States Biological Survey, 

 Department of Agriculture, for electros of many cuts, made 

 chiefly from my own drawings, ordered by the Department in 

 years gone by ; to Dr. C. Hart Merriam for the identification 

 of many specimens and much assistance; also to Mr. Edward 

 A. Preble for a critical reading of parts of the text. 



To Messrs. Vernon Bailey, W. H. Osgood, H. W. Hen- 

 shaw, T. S. Palmer, M.D., all of the United States Biological 

 Survey, for assistance in many technical matters. 



To Dr. Robert Bell I am indebted for essential aid in 

 preparing the geological sketch of Manitoba; to Professor 

 John Macoun and Mr. James M. Macoun, for many notes 

 and other assistance; also to Messrs. George M. Dawson, 

 A. P. Low, Percy H. Selwyn, all of the Canadian Geological 

 Survey. 



To Dr. J. A. Allen, of the American Museum of Natural 

 History, New York, for help especially in preparing the chapter 

 on Faunal Areas; to Mr. Frank M. Chapman for advice and 

 for help in many identifications, and to the American Museum 

 of Natural History for access to their collections and library, 

 etc., while preparing the technical descriptions. 



To Dr. W. T. Hornaday, of the New York Zoological 

 Society, for practical assistance in preparing parts of the text. 



To Mr. Miller Christy, of Chelmsford, England, for 

 several notes and much literary assistance. 



To Mr. George O. Shields for assistance in securing several 

 of my own drawings originally used in Recreation Magazine. 



