ACKNOWLEDGxMENTS 



I am under great obligations to Joseph Grinnell, G. I'>ean Alorcom, Robert 

 Ridgway and Harry S. Swarth, who have at all times been ready with advice 

 on perplexing questions, many of which I would have been entirely unable 

 to solve without their help. 



I am deeply indebted to W. Lee Chambers and Harry J. Lelande for the 

 unrestricted use of their fine libraries, to the Los Angeles Public Library and 

 to the Library of the University of California for the loan of books, and to 

 William and George Cline of Los Angeles for the privilege of examining their 

 fine collection of mounted birds. 



To the following members of the Cooper Club my thanks are due for the 

 use of specimens and notes : J. S. Appleton. Louis B. Bishop. J. Hooper Bowles, 

 William Brewster, Homer C. Burt, W. Lee Chambers. Wells W. Cooke, Frank 

 S. Daggett. Evan Davis. W. Leon Dawson. Edwin W. Gifford. ^L French Gil- 

 man. Joseph Grinnell. Alfred B- Howell. Ozra W. Howard, Albert M. Ingersrll. 

 Alphonse Jay. Antonin Jay. W. B. Judson, J. Eugene Law. Harry J. Lelande. 

 Clarence B. Linton. Leverett AL Loomis, Loye H. Miller. Harry C. (3berholser. 

 X'irgil W. Owen, Richard M. Perez. Lawrence Peyton. Sidney Peyton. Wright 

 AL Pierce. Roth Reynolds. Howard Robertson. Frank Stephens, Kate Stephens. 

 Harry S. Swarth, John E. Thayer, Adriaan van Rossem, Harry E. Wilder and 

 Howard W. Wright. 



GEORGE WILLETT. 

 Los Aiigclcs. California, 

 February i, 19J2, 



