410 
Psyche 
[Vol. 85 
polyethism is continuous rather than discretized. There is virtually 
no overlap between the sets of tasks performed by the two physical 
castes. These findings differ in several respects from those reported 
in two other studies of age polyethism (in the New World P. dentata 
and in Apis mellifera), and raise some interesting questions about 
labor roles in social insects. 
Acknowledgements 
Thanks to L. Calabi for invaluable discussion of, and help with, 
data analyses; to T. D. Seeley for a preprint of his paper and 
enlightening discussion of his methods; to S. D. Porter for a critical 
reading; to D. S. Gladstein for technical assistance with estimating 
repertory completeness; and to W. R. Tschinkel for pointing out an 
important reference. 
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