1911] 



Swarth: Alaska Expedition of 1909. 



153 



birds it is different. Excepting the singular distribution of the 

 grouse on the islands, the avian fauna is everywhere much 

 alike. 



For the purpose of this discussion the islands of the archi- 

 pelago may be roughly divided into three groups: northern 

 (Chichagof, Baranof, and Admiralty), central (Kuiu, Kupreanof, 

 and Mitkof), and southern (Prince of Wales and the islands to 

 the westward) . Zarembo possibly belongs in the latter category, 

 while those islands lying east of Clarence Straits are, as regards 

 their animal life, most like those of the central group. In the 

 first group we find several species of mammals apparently of 



DISTRIBUTION ^ 



5c/t/rus ^ pancouperensis 



IN 



SOUTHEASTERN ALASKA 



Jig i—Map showing the range of the red squirrel (Sciurus hudsonius 

 vancouverensis) in southeastern Alaska. It has invaded only the islands 

 most easy of access from the mainland. 



