B.S. 22207» Old channel of 

 Rio Negro, General Roca^ Rio 

 Negro, Ar gen tina» 



December 3, 1920# 



B.S. 22209# "allows growing 

 on gravel bars along Rio Negro# 

 General Roc a, Rxo Negro, Argentina, 



December 3, 1920* 



B.S. 22210. Small grebe, 

 Colymbus chilensis. General 

 Roc a, Rio Negro, Argentina. 



December 3, 1920# 



