VOL. XI, PP. 145-146 JUNE 9, 1897 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIONS OF A NEW EAGLE FROM ALASKA AND 

 A NEW SQUIRREL FROM LOWER CALIFORNIA. 



BY C. H. TOWNSEND. 



The following very distinct forms are among the collections 

 contributed by the writer to the U. S. National Museum between 

 1889 and 1895: 



Haliaetus leucocephalus alascanus new subspecies. 



Subspecific characters. Differing from H. leucocephalus in size, being con 

 siderably larger. 



Habitat. Alaska. 



Type. <$ (U. S. Nat. Mus. No. 151,567). Unalaska, Aleutian Islands, 

 May 22, 1895. C. H. Townsend. 



Dimensions of Type. Wing, 23.75; tail, 11.50; tarsus, 4 ; culmen, 2.60; 

 depth of bill, 1.50; hind claw, 1.50. 



Co mparat ive Measure me nts. 



In forty specimens examined from localities between Florida and 

 Alaska there is a regular increase in size northward. Eagles from north- 



34 BIOL. Soc. WASH.. VOL. XI, 1897 (145) 



