INTRODUCTION. vii 



We desire to express our appreciation o£ the valuable assistance we have 

 received from Mr. C. E. Hellmayr, of Munich, who has been good enough to 

 read the proofs and has made numerous corrections and additions. 



We also have to thank Mr, H. Kirke Swann for much material help, and we 

 desire to give him the entire credit for having supplied all the popular names, both 

 English and Spanish. 



Our best thanks are likewise due to the following gentlemen, who have helped 

 us in various ways : — Dr. P. L. Sclater, Mr. W. R. Ogilvie-Grant, the Honourable 

 Walter Rothschild, Mr. C. E. Fagan, Dr. E. Hartert, and Mr. H. 0. Oberholser. 



BRABOURNE, 



London, CHARLES CHUBB. 



December 20th, 1912. 



