Vin U. S. NATIONAL MUSEUM BULLETIN 211 



K. Frey, J. H. Gerard, H. B. Goldstein, L. I. Grinnell, Horace 

 Groskin, G. W. Gullion, R. H. Hansman, W. R. Hecht, J. W. Hopkins, 

 R. F. James, Verna R. Johnston, Malcolm Jollie, R. S. Judd, Louise 

 de K. Lawrence, G. H. Lowery, J. M. Markle, D. L. McKinley, Lyle 

 Miller, A. H. Morgan, R. A.' O'Reilly, K. C. Parkes, G. H. Parks, 

 O. M. Root, Doris H. Speirs, E. A. Stoner, and R. B. Williams. If 

 any contributor fails to find his or her name in this or in some previous 

 volume, the author would be glad to be advised. 



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

 the names of those who have not contributed to the work within 

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



Winsor M. Tyler rendered valuable assistance by reading and in- 

 dexing four of the leading ornithological journals for references. He 

 and Alfred O. Gross each contributed two complete life histories. 

 Alexander F. Skutch, Alexander Sprunt, Jr., Laidlaw Williams, and 

 Robert S. Woods have each contributed one complete life history. 



The greater part of the egg measurements were taken from the 

 register sheets of the United States National Museum by William 

 George F. Harris, who also relieved the author of a vast amount of 

 detail work by collecting and figuring hundreds of egg measurements 

 and by collecting, sorting, and arranging several thousand nesting 

 records to make up the "egg dates" paragraphs. 



Through the courtesy of the Fish and Wildlife Service, Mr. Chandler 

 S. Robbins has compiled the migration paragraphs. The distribution 

 data have been taken from advance sheets of the fifth edition of 

 the A. O. U. "Check-List of North American birds." The author 

 claims no credit and assumes no responsibility for these data, which 

 are taken from the great mass of records on file in Washington. 



The manuscript for this bulletin was completed in 1949. Contri- 

 butions received since then will be acknowledged later. Only infor- 

 mation of great importance could be added. The reader is reminded 

 again that this is a cooperative work; if he fails to find in these vol- 

 umes anything that he knows about the birds, he can only blame 

 himself for not having sent the information to — 



The Author. 



