68 



GEOGRAPHICAL DISTRIBUTION 



are exclusive of many species of Winter Visitors, a small minority 

 of which are left behind in autumn, and are presumably residents, 

 though the great majority of the individuals representing the 

 species in our Islands migrate in spring to more northerly breed- 

 ing-grounds, and thus cause the species to be included in the 

 list of Winter Visitors. It is also exclusive of a few species of 

 summer visitors, of which some individuals remain with us all 

 the wiuter. 



PARTIAL RESIDENTS. 



