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Variability in characters commonly used to distinguish Aphidius species (Hymenoptera: Aphidiidae)

Abstract Characters traditionally used to separate some Aphidius species commonly parasitizing pea and cereal aphids are shown to be more variable than previously supposed. Aphidius ervi, picipes and rhopalosiphi (Hymenoptera: Aphidiidae) were cultured and the variability of the numbers of antennal segments, sculpture on the anterolateral area of the petiole and the tentorial index were recorded. The number of antennal segments in each of the three species varied by four in males and by three in females. The numbers of ridges on the anterolateral area of the petiole of A.rhopalosiphi varied widely from six to eighteen. The tentorial index range from 0.35–0.62, 0.34–0.54 and 0.35–0.60 for A.ervi, picipes and rhopalosiphi respectively, compared with previously published ranges of 0.30–0.40, 0.28–0.37 and 0.30–0.35. A.rhopalosiphi and uzbekistanicus cannot be distinguished reliably by the wing‐vein length ratios previously used.