XXVI 



U.S. NATIONAL MUSEUM BULLETIN 237 



new information has become available since their completion. These 

 added paragraphs, each of which is signed or initialed by its con- 

 tributor, I have tried to keep to a minimum. 



As with the preceding volumes, the data on and descriptions of 

 eggs have been provided by William George F. Harris, and the dis- 

 tribution and migrations sections have been prepared by Chandler 

 S. Robbins through the courtesy of the Bureau of Sports Fisheries 

 and Wildhfe. The editor and the respective contributors conse- 

 quently claim no credit and assume no responsibility for these sections. 



Exceptional thanks are due to Aretas Andrews Saunders, who not 

 only contributed much information directly to the Voice sections, 

 but made available to the series his unpublished manuscript, "The 

 Songs and Calls of American Bu'ds," prepared under a grant from 

 the American Philosophical Society and now in the Josselyn Van Tyne 

 Memorial Library at Ann Arbor, Michigan. Richard R. Graber 

 most generously allowed us to quote his unpubUshed thesis on ju venal 

 plumages. Most of the illustrations were selected and their captions 

 prepared by Arthur W. Argue. Oscar M. Root has been particularly 

 helpful in checking bibliographies, reading proof, and in general 

 ' 'trouble-shooting. ' ' 



For their whole-hearted and enthusiastic cooperation I take great 

 pleasure in thanking the following authors who, in addition to those 

 mentioned above, have contributed material to these final three 

 volumes: 



Anders H. Anderson 



Donald Henry Baepler 



James Baird 



Paul H. Baldwin 



Richard C. Banks 



Henry E. Baumgarten 



Marguerite Heydweiller Baumgartner 



Andrew John Berger 



Hugh M. S. Blair 



Mary Sutherland Blair 



Charles Henry Blake 



Emmet Reid Blake 



James Bond 



Verdi Burtch 



John B. Bushman 



Henry E. Childs, Jr. 



Roland Charles Clement 



Howard L. Cogswell 



William ]\Iaitland Congreve 



John M. Conkey 



James Ensign Crouch 



Frederic W. Davis 



John Davis 



William Ryan Dawson 



Barbara Blanchard DeWolfe 



Robert W. Dickerman 



Joshua CUfton Dickinson, Jr. 



Keith Lee Dixon 



Audrey C. Downer 



Stephen W. Eaton 



John Jackson Elliott 



Mar3' Mar ilia Erickson 



George M. Fairfield 



J. Bruce Falls 



Norman Roger French 



Ira N. Gabrielson 



Jean W. Graber 



W. E. Griffee 



Neil F. Hadley 



Wilson C. Hanna 



Ed. N. Harrison 



Travis G. Haws 



C. Lynn Hayward 



Matti Helminen 



Carl Helms 



Norman Pierce Hill 



Thomas Raymond Howell 



John B. Hurley 



