Abstract
Introduction equilibrium sex ratio depended on the probability that males developed at the expense of their sisters. When this probability was high, fue sex ratio was strongly female biased, whereas if low, fue sex ratio moved in favour of males. However, altemative explanations for adaptive sex ratios in heteronomous hyperparasitoids have since been proposed (Godfray & Waage, 1990). The theory of Godfray & Waage, which focuses on fue behaviour of female parasitoids facing egg or time constraints on their reproduction, has received strong support from subsequent empirical s~dies (Hunter & Godfray, 1995). In this study I address fue question as to whether or not a female heteronomous hyperparasitoid shows discriminative behaviour in fue production of males when ofreced her own progeny or that of an unrelated
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