182 
Psyche 
[June 
and also that within plants, P. imbridana may avoid ovipositing on 
burrs previously attacked by others of its own or different species. 
Further investigations are in progress to determine which particu- 
lar aspects of burr morphology and chemistry most strongly influ- 
ence susceptibility of burrs to each insect species. 
Acknowledgements 
I thank William E. Miller and a reviewer for their information 
concerning the taxonomy and ecology of the genus Phaneta. Spec- 
imens were kindly identified by D. R. Davis of the U. S. National 
Museum. Contribution #226 from the program of Ecology and 
Evolution at the State University of New York at Stony Brook. 
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