1973] 
Gamboa & Alcock — Brochymena 
269 
females. Interestingly, very similar behavior has been reported for 
the distantly related African pentatomid Calidea dregii, a member 
of the Scutellerini (Kaufmann, 1966). 
Finally the fact that different members of the same genus (e.g. 
Brochymena , Podisus) may exhibit basically different methods of 
initiating genital linkage suggests that this component of reproduc- 
tive behavior is evolutionarily labile. The reasons for evolutionary 
changes of this sort remain obscure. 
Acknowledgments 
We thank Elinor Lehto for the identification of the plants men- 
tioned in the paper. Alan R. Hardy of the California Department 
of Agriculture provided the identifications of Brochymena and 
Thyanta for which we are grateful. This research was supported 
in part by NSF grant GB-35269. 
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