Field Museum of Natural History. 



Publication 160. 



Report Series. Vol. IV, No. 2. 



ANNUAL REPORT OF THE 

 DIRECTOR 



TO THE 



BOARD OF TRUSTEES 



FOR THE YEAR 19 11. 



Chicago, U. S. A. 



r ,^,, THE LIBRARY Of I HE 



[anuary, 1912. 



DEC 2 21942 

 UNIVERSIiy OF \iim\^ 



