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 Ethelurgus genus group (subtribe Ethelurgina sensu Townes (1970)) Two genera, Ethelurgus Förster, 1869 and Rhembobius Förster, 1869 , have been recorded from Japan . In this study, I review both genera. The Japanese genera can be distinguished by the following key. Key to Japanese genera of Ethelurgus genus group 1. Vein 2m-cu vertical ( Fig. 32C ). Propodeum with strong, projecting apophyses ( Figs 32A, D ). T II largely smooth except for longitudinally striate basally in Japanese species ( Fig. 32D ). ................................................ Rhembobius Förster, 1869 * -. Vein 2m-cu inclivous. Propodeum without distinct apophyses ( Figs 30A , 31A ). T II largely punctate in Japanese species. ................................................. Ethelurgus Förster, 1869 ** * This genus is sometimes misidentified with Pleolophus Townes, 1962 (Aptesini Smith & Shenfelt, 1955 of Cryptinae ) because vein 2m-cu vertical. Users should carefully check the character states of them. ** This genus is sometimes misidentified with Stibeutes Förster, 1869 ( Phygadeuon genus group). Users should carefully check the character states of clypeus, propodeum, and ovipositor.