Contribution to the Mesochorinae of Sweden (Hymenoptera: Ichneumonidae)

Abstract

For this study, a part of the Swedish material of the subfamily Mesochorinae (Hymenoptera: Ichneumonidae) collected by the Swedish Malaise Trap Project (SMTP) was determined. In the available material 97 different species of Mesochorinae were identified, 31 of them are new records for the Swedish fauna. Four species are new to science: Mesochorus albofacies sp. nov., Mesochorus longivalvator nov.sp., Mesochorus nigritor sp. nov. and Mesochorus nigroclypeatus sp. nov. The new taxa are described in detail and illustrated here.

For Mesochorus frigidus Schwenke, 1999 and Mesochorus macrophyae Schwenke, 1999, the previously unknown males are described. Mesochorus skanensis Vikberg, 2017 is synonymized with Mesochorus terebratus Schwenke, 1999 and Mesochorus acutus Schwenke, 1999 is re-established as a separate species from Mesochorus suomiensis Schwenke, 1999. Stictopisthus Thomson is regarded as a subgenus of Mesochorus Gravenhorst.

This is the third contribution to the fauna of Ichneumonidae from the Swedish Malaise Trap Project, following Riedel & Magnusson (2014) and Riedel & Magnusson (2017).