Abstract
The adult longevity of Tribolium castaneum and T. confusum males in single sex groups was less than half that in a mixed population of the same size and less than a third of that in isolated individuals. Dead males in homosexual groups all exhibited, at the tip of the abdomen, a hard whitish accretion which was probably an accumulation of flour particles embedded in solidified seminal fluid deposited by another individual during homosexual activity. The longevity of male T. castaneum was enhanced by isolation, but not by the presence of eggs of this species.
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