X BULLETIN 203, UNITED STATES NATIONAL MUSEUM 



The paragraphs on distribution for the Colima and Kirtland's 

 warblers were supplied by Dr. Josselyn Van Tyne with his contribu- 

 tions on these species. 



All other data on distribution and migration were contributed by 

 the Fish and Wildlife Service under the supervision of Frederick C. 

 Lincoln. 



The same general plan has been followed as explained in previous 

 bulletins, and the same sources of information have been used. It 

 does not seem necessary to explain the plan again here. The nomen- 

 clature of the Check-List of North American Birds (1931), with its 

 supplements, of the American Ornithologists' Union, has been fol- 

 lowed. Forms not recognized in this list have not been included. 



Many who have contributed material for previous Bulletins have 

 continued to cooperate. Receipts of material from several hundred 

 contributors has been acknowledged in previous Bulletins. In addi- 

 tion to these, our thanks are due to the following new contributors : 

 G. A. Ammann, O. L. Austin, Jr., F. S. Barkalow, Jr., Ralph Beebe, 

 H. E. Bennett, A. J. Berger, Virgilio Biaggi, Jr., C. H. Blake, Don 

 Bleitz, B. J. Blincoe, L. C. Brecher, Jeanne Broley, Maurice Broun, 

 J. H. Buckalew, I. W. Burr, N. K. Carpenter, May T. Cooke, H. L. 

 Crockett, Grace Crowe, Ruby Curry, J. V. Dennis, E. von S. Dingle, 

 M. S. Dunlap, J. J. Elliott, A. H. Fast, Edith K. Frey, J. E. Galley, 

 J. H. Gerard, Lydia Getell, H. B. Goldstein, Alan Gordon, L. I. Grin- 

 neU, Horace Groskin, F. G. Gross, G. W. Gullion, E. M. Hall, R. H. 

 Hansman, Katharine C. Harding, H. H. Harrison, J. W. Hopkins, 

 N. L. Huff, Verna R. Johnston, Malcolm Jollie, R. S. Judd, M. B. Land, 

 Louise de K. Lawrence, R. E. Lawrence, G. H. Lowery, J. M. Markle, 

 C. R. Mason, D. L. McKinley, R. J. Middleton, Lyle Miller, A. H. Mor- 

 gan, R. H. Myers, W. H. Nicholson, F. H. Orcutt, H. L. Orians, R. A. 

 O'Reilly, A. A. Outram, G. H. Parks, K. C. Parkes, M. M. Peet, J. L. 

 Peters, F. A. Pitelka, Mariana Roach, James Rooney, Jr., O. M. Root, 

 G. B. Saunders, James Sawders, Mary C. Shaub, Dorothy E. Snyder, 

 Doris Heustis Speirs, E. A. Stoner, P. B. Street, H. R. Sweet, E. W. 

 Teale, A. B. Williams, G. G. Williams, R. B. Williams, Mrs. T. E. 

 Winford, and A. M. Woodbury. 



As the demand for these Bulletins is much greater than the supply, 

 the names of those who have not contributed to the work during recent 

 years will be dropped from the author's mailing list. 



Dr. Winsor M. Tyler has again read and indexed for this volume 

 a large part of the current literature on North American birds and 

 has contributed four complete life histories. Dr. Alfred O. Gross has 

 written stories on the yellowthroats {Geothlypis trichas) and has con- 

 tributed three other complete life histories. Edward von S. Dingle, 

 Alexander Sprunt, Jr., and Dr. Josselyn Van Tyne have contributed 

 two complete life histories each. 



