Abstract
The giant supernumerary larvae or adultoids of Pyrrhocoris apterus, induced by contact of the last instar larvae with juvabione, dehydrojuvabione, or methylfarnesoate dihydrochloride, exhibit adult sexual behaviour which has never been observed in the normal larvae. The female supernumerary larvae are attractive to adult males inducing their mating behaviour. The male supernumerary larvae make efforts to copulate with adult females or with the female supernumerary larvae. Sexual behaviour in supernumerary larvae of both sexes is related to the degree of morphological and physiological influence produced by agents with juvenile hormone activity.
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