INTRODUCTION XI 



valuable negatives and Maj. Allan Brooks loaned two beautiful 

 drawings. Thanks are due to the late Frank C. Willard for many 

 hours of careful work in collecting, arranging, and figuring a great 

 mass of data on egg dates and measurements; the author would 

 be glad to have some one volunteer to undertake this work in 

 future. The author is much indebted to Dr. Charles W. Richmond, 

 of the United States National Museum, for many hours of careful 

 and sympathetic work in reading the proofs and correcting errors 

 in this and all previous volumes; his expert knowledge has been 

 of great value. 



The manuscript for this volume was completed in January, 1931. 

 Contributions received since then will be acknowledged later. Only 

 information of great importance could be added. The reader is 

 reminded again that this is a cooperative work; if he fails to find 

 in these volumes anything that he knows about the birds, he can 

 blame himself for not having sent the information to 



The Author. 



