PREFACE 



Hallinan's "Notes on Some Panama Canal 

 Zone Birds with Special Reference to Their 

 Food," Auk, vol. xli, No. 2, April 1924; 

 also the volumes on birds of the Biologia 

 Centrali- Americana, by Salvin and Godman; 

 M. A. Carriker, Jr.'s ''Annotated List of the 

 Birds of Costa Rica, including Cocos Island," 

 Annals Carnegie Museum, vol. vi, No. 4, 

 Aug., 1910, and "Notes on a Collection of 

 Birds from Eastern Nicaragua and the Rio 

 Frio, Costa Rica," by Charles W. Rich- 

 mond, Proc. U. S. National Museum, xvi, 

 1893. 



The plates are by Mr. F. L. Jaques and the 

 remainder of the illustrations used through- 

 out the text were drawn by Mr. Rudyerd 

 Boulton, of the Carnegie Museum, Pitts- 

 burgh, Pennsylvania. 



Whatever merits this work may possess are 

 largely due to the advice and assistance of the 

 staff of the Department of Ornithology of the 

 American Museum of Natural History in 

 New York, including Dr. Frank M. Chap- 

 man, Mr. De Witt Miller, Dr. Robert Cush- 

 man Murphy, Dr. James P. Chapin and Mr. 

 Ludlow Griscom, who not only have allowed 

 me the unrestricted use of the facilities of the 

 Museum, with its splendid series of speci- 

 mens of birds of the American tropics, but 

 have also devoted much time and trouble to 

 giving me personal assistance on many im- 



that time (1918), giving many notes on habits, nesting, 

 colors of the bill and feet when fresh, etc., not previously 

 published. Its introduction also gives a summary of the 

 ornithological work done on the Isthmus, with references 

 to the more important literature concerning it. 



