Abstract
In nests of Vespa orientalis, sounds are produced both by the larvae (hunger signal) and the adults. Adult workers mainly produce solid borne sounds by tapping the abdomen tip against the rim of the comb. Among these distinct series of tapping sounds is that produced by one or several workers facing the queen as she rests between oviposition sessions. Statistical analysis of 25 series of such taps shows that consecutive taps in a given series tend to be associated in one of the following combinations: (a) much frequency autoassociation, and little amplitude autoassociation; (b) much amplitude autoassociation. It seems that in (a), the tapping is executed in a manner resembling radio frequency modulation (FM), while in (b) it resembles radio amplitude modulation (AM).
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