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THE AM ERICA X NATURALIST. [Vol. XXXVI I 



been confined to that part of Patagonia north of the Rio Santa Cruz, 

 for this river forms the natural southern boundary line for lizards as 

 well as of armadillos though a few have been scattered south of it 

 by man. In describing the Guanaco on page 271, he says: "Their 

 presence in Fuego, to which island the rhea, puma and deer have 

 not gained access, is but an illustration of their superior powers of 

 self distribution." The distribution of guanaco on Tierra del Fuego 

 is far more probably attributable to the agency of man, for since 

 time immemorial the channel Indians have plied between Patagonia 

 and Fuego in their canoes and might easily have introduced these 

 animals. 



Barnum Brown. 



