DEPAKTMENT OF THE INTERIOK. 



UNITED STATES GEOLOGICAL AND GEOGRAPHICAL SURVEY OF THE TERRITORIES. 



F. V. HAYDEN, U. S. Geologist-in-Charge. 



I.-SEXUAL, INDIVIDUAL, AND GEOGRAPHICAL VARIATION 

 IN LEUCOSTICTE TEPHROCOTIS. 



By J. A. ALLEN. 



II.-GEOGRAPHICAL VARIATION AMONG NORTH AMERICAN 

 MAMMALS, ESPECIALLY IN RESPECT TO SIZE. 



By J. A. ALLEN. 



EXTRACTED FROM BULLETIN OF THE GEOLOGICAL AND GEOGRAPHICAL SURVEY 

 OF THE TERRITORIES, VOL. II, No. 4. 



WASHINGTON, July 1, 1876. 



