1911] Miller: Eagle Tarsi from Ranch o La Brea. 311 



the southward, or as it may be otherwise stated, a highly vari- 

 able Pleistocene species has responded to the environment of a 



1 



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 1 



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II 

 ii 



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Plot of the lengths of the twelve tarsometatarsi of the fossil phase of 

 Haliaetus leucocephalus. Recent specimens of the subspecies of alascanus 

 and leucocephalus are interpolated in dotted lines. The vertical dis- 

 tances from the base line represent the actual lengths of specimens as 

 measured in millimeters. 



colder climate by producing a preponderance of large individ- 

 uals and to that of a warmer climate by the production of 

 smaller ones. 



