state xvju»^nv' 



Field Museum of Natural History. 



Publication 206. 



Report Series. Vol. V, No.:6. 



ANNUAL REPORT OF THE 

 DIRECTOR 



TO THE 



BOARD OF TRUSTEES 



FOR THE YEAR 1920. 



Chicago, U. S. A. 

 January, 1921. 



THE LIBRARY OF TiiE 



JAN 2 4^cibO 



(JNlVEP.C-in 



