Taxonomic and Zoogeographic Study of the Japanese Phygadeuontinae (Hymenoptera, Ichneumonidae), with Descriptions of 17 New Species Author Watanabe, Kyohei Kanagawa Prefectural Museum of Natural History, 499 Iryuda, Odawara, Kanagawa 250 – 0031, Japan watanabe-k@nh‛kanagawa-museum‛jp text Bulletin of the Kanagawa Prefectural Museum (Natural Science) 2021 2021-03-30 50 55 136 https://doi.org/10.32225/bkpmnh.2021.50_55 journal article 300009 10.32225/bkpmnh.2021.50_55 70224806-ca38-47ca-bd8a-63da3ac532f9 2189-6720 12774639 DD695C62-DC2F-4D32-8D33-52648E28661D Genus Mesoleptus Gravenhorst, 1829 Mesoleptus Gravenhorst, 1829: 3 . Type : Ichneumon laevigatus Gravenhorst, 1820 . Designated by Curtis (1837) . Exolytus Holmgren, 1859: 328 . Type : Ichneumon laevigatus Gravenhorst, 1820 . Monobasic. Two species, Mes. laticinctus (Walker, 1874) and Mes. sapporensis ( Uchida, 1930 ) , have been recorded from Japan . I recognize a newly recorded species, Mes. laevigatus ( Gravenhorst, 1829 ) , and at least three undetermined species from Japan . The taxonomic treatment of the undetermined species requires the additional specimens and comparison with European species. In this study, I record Mes. laevigatus from Japan for the first time and some distribution records of Mes. sapporensis below.