




X 

The American Naturalist. 
ASSOCIATE EDITORS: 
J. A. ALLEN, PH.D., American Museum of Natural History, New York. 
E A. AN DREWS, PH.D., Johns Hopkins University, Baltimore. 
L : 
STOCK, a 
JILLIAM M. DAVIS, M.E., Harvard University, Cambridge. 
ALES HRDLICKA, M.D., Vew York City. 
D. S. JORDAN, LL.D., Stan, Univer. 
-CHA 
tanford ersity. 
S A. ALAS PH.D., University E Cali "eie Berkeley. 
EEDHA 



