PREFACE TO SECOND EDITION. 



The necessity for a second edition of my work on the Accipitres 

 arose in the first place out of the many corrections called for in 

 the first part of my " Sjmoptical List," owing to the fact that 

 that first part was rather a compilation than an original work, 

 and in the second place out of the additions and corrections to 

 the whole work that followed upon a more intensive study 

 of the various groups. For this second edition I have had 

 the advantage of consulting Mr. W. Sclater's MS. list of the 

 Accipitres which he prepared for publication in the interval 

 between my two editions, but kindly placed at my disposal 

 on learning of the preparation of my second edition. From 

 Mr. Sclater's MS. hst I have received some amount of help with 

 the nomenclature and also with the type species of the genera. 

 I owe also a great measure of thanks to Mr. Outriam Bangs, 

 Dr. Chapman, Dr. Richmond, Dr. Wetmore, Dr. Oberholser, 

 Mr. J. H. Riley, and other American friends who assisted me 

 in my work at the American museums last autumn, while the 

 authorities at the Brit. Museum (Nat. Hist.) and at Tring 

 have continued to give me every faciHty for my work. Even 

 now, I am not sure that I can claim that this second edition, 

 practically re-written as it is, is either complete or perfect, but, 

 so far as human exertion can go, I have striven to make it so, 

 and I leave it to my critics to discover its shortcomings. The 

 signs (*) and (f) I have prefixed to the numbers in this edition 

 denote respectively that I have skins or eggs in my own collec- 

 tion. Of skins I possess now about 1000 of some 200 different 

 forms, while of eggs I have 1200 of 156 different forms. AU 

 others, needless to say, are desiderata. 



H K S 

 March, 1922. 



