A new genus, Cyanosesia gen. nov., and seven new species, Similipepsis bicingulata sp. nov., Cyanosesia tonkinensis sp. nov., C. vietnamica sp. nov., Aschistophleps xanthocrista sp. nov., Synanthedon aurifasciatum sp. nov., Ichneumenoptera vietnamica sp. nov. and I. caudata sp. nov., are described and illustrated from Vietnam. Redescription of Tinthia spilogastra Le Cerf, 1916, as well as a redescription and data on the bionomies and habitat are provided for Ichneumenoptera duporti (Le Cerf, 1927). Tinthia spilogastra Le Cerf, 1916, is recorded from Vietnam for the first time.
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