Abstract
The trend of specialization in the male genitalia and the adjacent sclerites is traced within the order Hymenoptera (Insecta) and the morphological problems of these parts discussed. In the Ichneumonidae, these sclerites appear to have little or no tribal or subfamily characteristics of practical value to the taxonomist, such differentiation being masked extensively by specific variation. Thirty-four tribes and ninety-six species were studied. One hundred and fifty-eight figures are shown.

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