Distinction From Braconidae
Ichneumonidae is distinguished from its sister group Braconidae by the following character combinations. Vein 2m-cu of the forewing is present in 95% of Ichneumonidae - it is absent in Braconidae; Vein 1/Rs+M is absent in all Ichneumonidae- it is present in 85% of Braconidae.Vein 1R-M of the hind wing is opposite or apical to the separation of R1 and Rs in Ichneumonidae- it is basal in Braconidae. 90% of Ichneumonidae have a flexible suture between metasomal tergum 2 and 3 -these tergites are fused in Braconidae (though the suture is secondarily flexible in Aphidiinae).
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