Key for identification of female parasitoids belonging to the Aphidius urticae s. str. species group

1 Metacarpus shorter than stigma (Fig. 4 e); mediodorsal carina on petiole prominent and clearly defined (Fig. 4 f); parasitoid of Macrosiphum funestum (large blackberry aphid).............................................. Aphidius rubi Starý

- Metacarpus equal to or slightly longer than stigma (Fig. 5 e); mediodorsal carina on petiole short and not clearly defined (Fig. 5 f)................................................................................................ 2

2 Three or two longitudinal placodes on F2; tentorial index 0.45–0.55; parasitoid of Amphorophora aphids................................................................................................ .. Aphidius silvaticus Starý

- One longitudinal placode on F2; tentorial index 0.35–0.40; parasitoid of Microlophium carnosum (common nettle aphid).................................................................................... Aphidius urticae Haliday