INTRODUCTIOiN. 



This Bulletin contains a continuation of the work on the life his- 

 tories of North American birds, begun in Bulletin lOY and continued 

 in Bulletin 113. The same general plan has been followed and the 

 same sources of information have been utilized. Nearly all of those 

 who contributed material for, or helped in preparing, the former 

 volumes have rendered similar service in this case. In addition to 

 those whose contributions have been previously acknowledged, my 

 thanlcs are due to the following contributors : 



Photographs have been contributed, or their use authorized, by 

 A. W. Anthony, D. A. Bannerman, H. H. Bailey, Edwin Beaupre, 

 Biological Survey, W. K. Fisher, Joseph Grinnell, A. O. Gross, 

 J. H. Gurney, Maud D. Haviland, Lynds Jones, F. H. Kennard, R. C. 

 Murphy, E. W. Nelson, and P. B. Philipp. 



Notes and data have been contributed by D. E. Brown, T. D. 

 Burleigh, A. J. Campbell, H. F. Lpwis, J. T. Nichols, C. W. Rich- 

 mond, and J. R. Whitaker. 



The distributional part of this Bulletin has been done by the 

 author. Messrs. Robert Cushman Murphy and John Treadwell 

 Nichols have examined and revised the distribution of the Tubinares 

 and Mr. James H. Fleming has done the same for the Steganopodes. 



In the two previous Bulletins the author adopted, without any 

 changes, the nomenclature of the 1910 edition of the check list of the 

 American Ornithologists' Union. But, now that a new check list is 

 in preparation, it seems best to adopt the names that will probably 

 appear in the new check list, so far as they are now understood by 



The Author. 



