72 
Psyche 
[June 
tence. Finally, it is interesting to note that the predicted social modi- 
fications are just as likely to be developed in any ant species sufficiently 
ecologically restricted to be partitioned into very small denies. 
Acknowledgements 
The author wishes to thank Mr. Donald Dunston and Dr. and Mrs. 
John Buxton for their valuable assistance in exploring the Oropouche 
Cave. He is also indebted to Prof. A. E. Emerson for determining 
the termite prey of the Surinam Erebomyrma; and to Prof. W. L. 
Brown, Prof. K. Christiansen, Prof. W. S. Creighton, Dr. W. W. 
Kempf, and Mr. R. W. Taylor for critical readings of the manuscript. 
The field study was supported by a grant from the National Science 
Foundation. 
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