VI PREFACE. 



upon the same subject by M. Trouessart ; I have checked 

 and added to the facts that I had accumulated by a careful 

 comparison of them with the article Geographical Dis- 

 tribution in Prof. Newton's Dictionary of Birds. Numerous 

 special memoirs have also been laid under contribution, 

 a reference to which will be found in the proper place. 



FRANK E. BEDDARD. 



LONDON. 



November, 1894. 



