312 
Psyche 
[Vol. 90 
The rapid transport by Polyergus of adult Formica slaves to an 
overwintering site shortens the emigration time during a season 
characterized by increasingly unfavorable weather, and quickly re- 
locates the Formica slaves to the new nest where they are needed for 
overall colony maintenance. 
Acknowledgments 
This study is part of a dissertation by the senior author, submitted 
to the graduate faculty in Biology of the City University of New 
York. The research was supported by NIMH Training Grant 14280. 
Special thanks go to Mr. Raymond Sanwald for his field assistance. 
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