Introduction xxiii 



to embody much information derived both from his notes 

 and from w hat he has told me from his own experiences. 

 Mr. Edward R. Warren has also helped me in many cases 

 with specimens and information, and has kindly allowed 

 me to make use of several MSS. lists of birds drawn up 

 by him, especially those made in various places in 

 Gunnison county. 



To Judge Junius Henderson and to the authorities of 

 the State University of Colorado, I am indebted for the 

 use of the invaluable notes kept during many years of 

 collecting by the late Mr. Dennis Gale, of Gold Hill, 

 Boulder co. 



All the information we have in regard to the breeding 

 of a large number of species of Colorado birds is to be 

 found in these note-books, which have been most 

 carefully arranged, indexed and typewritten by Mr. 

 Henderson, and which are now the property of the State 

 University. 



Messrs. R. B. Rockwell, L. J. Hersey, F. M. Dille and 

 H. G. Smith, all of Denver ; Mr. C. S. Thompson, of Glen- 

 wood Springs ; and Messrs. W. VV. Cooke, H. C. Oberholser 

 and C. W. Richmond, of Washington, have all helped 

 me in various ways with information or advice, and to 

 all these gentlemen my heartiest thanks are hereby 

 tendered. 



For the photographs illustrating principally the nests 

 and eggs of Colorado birds I have to thank again Messrs. 

 E. R. Warren, R. B. Rockwell and L. J. Hersey, as well 

 as Mr. H. W. Nash, of Pueblo. In each case an acknow- 

 ledgment of the source of the photograph reproduced is 

 given. 



