INTRODUCTION. 



I cannot finish these introductory remarks without acknowledging 

 the great assistance I have derived from Dr. Finsch's work ' Die 

 Papageien ' j this is one of the best ornithological works which has 

 ever been published, and the care bestowed by Dr. Finsch on the 

 historical part of the species cannot be too highly appreciated. 

 Unfortunately Dr. Finsch was misled in many cases by the idea 

 that the sexes were alike. In my opinion, also, Dr. Finsch did not 

 pay the necessary attention to the less conspicuous differences con- 

 nected with geographical distribution, so that he often united species 

 which are to be recognized as distinct. 



I have to acknowledge also the assistance I have received from 

 many friends, and to return them my best thanks ; I wish particu- 

 larly to mention Mr. Salvin, Dr. Sclater, Mr. Seebohm, Prof. Newton. 

 Canon Tristram, the Hon. Walter Rothschild, Dr. Reiehenow, 

 Dr. Finsch, Dr. Meyer, Graf von Berlepsch, Dr. W. Blasius, 

 Dr. Schauinsland, Dr. Stolzmann, Dr. Oustalet, and M. Salle. 



TOMMASO SALVADORI. 



Turin, Zoological Museum, 

 December 1891. 



VOL XX. 



