INTRODUCTION ^ 



William George F. Harris has increased his valuable contribution 

 to the work by producing the entire paragi^aphs on eggs, including 

 descriptions of the eggs in their exact colors, assembling and averag- 

 ing the measurements, and collecting and arranging the egg dates, 

 as they appear under Distribution; the preparation of this last item 

 alone required the handling of over 5,600 records. 



Clarence F. Smith has furnished references to food habits of all 

 the species of wood warblers. Aretas A. Saunders has contributed 

 full and accurate descriptions of the songs and call notes of all the 

 species with which he is familiar, based on his extensive musical rec- 

 ords. Dr. Alexander F. Skutch has sent us full accounts of all the 

 North American wood warblers that migrate through or spend the 

 winter in Central America, with dates of arrival and departure. 

 James Lee Peters has furnished descriptions of molts and plumages 

 of several species and has copied several original descriptions of sub- 

 species from publications that were not available to the author. 



Eggs were measured for this volume by American Museum of Natu- 

 ral History (C. K. Nichols). California Academy of Sciences (K T. 

 Orr), Colorado Museum of Natural History (F. G. Brandenburg), 

 C. E. Doe, W. E. Griffee, W. C. Hanna, E. N. Harrison, H. L. Heaton, 

 A. D. Henderson, Museum of Comparative Zoology ( W. G. F. Harris) , 

 and Museum of Vertebrate Zoology (M. Jollie) . 



The manuscript for this Bulletin was written in 1945; only impor- 

 tant information could be added. If the reader fails to find m these 

 pages anything that he knows about the birds, he can only blame him- 

 self for failing to send the information to— 



The Author. 



