300 
Psyche 
[December 
a genus than between genera. The analysis is based on about a third 
of the world species in each of several genera of the tribe Formicini. 
Comparison in more genera, from several subfamilies, again indicates 
this prominent within-genus likeness of behavior. 
Acknowledgements 
I thank P. Y. Yahiku for help with statistics, and L. R. Brand, 
D. G. Kissinger, and R. E. Ryckman for reading the manuscript. 
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