Abstract
The normal host plants of the oligophagus beetle Gastrophysa cyanea (Melsheimer) are polygonaceous plants of the genus Rumex . Larvae were found to be somewhat more selective in their feeding preferences than were adults, but both larvae and adults fed to some extent on plants that were unsuitable for development or were toxic. Adult females oviposited, under certain conditions, on plants unsuitable for larval development. Both larvae and adults responded to host-plant extracts incorporated into synthetic diets. Apparently, some chemical in polygonaceous plants is attractive to this insect; however, larvae could not develop to maturity nor could adults produce eggs while feeding on nutrient diets containing plant extracts. Behavior of adults was studied in various artificial environments. The size of the cages and the other physical factors of these environments had little effect on behavior.
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