The Sex Ratio in Field Populations of Some Aphid Parasites 1

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Abstract
A sex ratio of equal numbers of males and females, as predicted by Fisher' s theorem, was compared with the sex ratio that was observed in field populations of 3 hymenopterous parasites of pea aphid. It was shown that in Aphidius ervi pulcher, A. smithi, and Praon pequodorum the proportion of females usually exceeded that of males, with the mean, tertiary sex ratio being approximately p̄ = 0.6. In the field all or nearly all females were mated and presumably contributed equally to the production of either sex. Some problems that affect the analysis of the sex ratio in Aphidiidae are discussed.

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