164 LIST OF DIT7BNAL BIRDS OF PKEY. 



localities, if such there be, where both races occur and where 

 hybridism may perhaps result from such propinquity. As I 

 have already mentioned in my Notes, the Norwich Museum 

 possesses three immature Falcons from Hudson^s Bay, and 

 these I believe to be referable to H. gyrfalco ; but as they are 

 not in adult dress, I do not feel absolutely certain of the cor- 

 rectness of this identification : the question of the geogra- 

 phical range of these Falcons is one which I think afibrds an 

 interesting subject for further investigation, and which I 

 trust will receive the attention that it merits. 



