-- Review- - of- - the- - genus Diplazon- - Nees, -- 1819 -- (Hymenoptera: -- Ichneumonidae Diplazontinae) -- from- - Japan Author Morishita, Shunsuke Hatchodori 4 - 9, Toyohashi, Aichi 440 - 0806, Japan. Author Watanabe, Kyohei 0000-0002-8242-8611 Kanagawa Prefectural Museum of Natural History, Iryuda 499, Odawara, Kanagawa 250 - 0031, Japan. watanabe-k @ nh. kanagawa-museum. jp; https: // orcid. org / 0000 - 0002 - 8242 - 8611 watanabe-k@nh.kanagawa-museum.jp text Zootaxa 2021 2021-04-21 4964 1 103 122 journal article 7067 10.11646/zootaxa.4964.1.5 63986af4-a04f-47f6-a9db-983b7474acd1 1175-5326 4706743 ACC0503E-617A-4DC5-A967-4F2299F1A123 Genus Diplazon Nees, 1819 Diplazon Nees, 1819 in Gravenhorst, 1819: 292 . Type species: Ichneumon laetatorius Fabricius, 1781 ; designated by Viereck, 1914: 46 . Diagnosis. According to Klopfstein (2014) , this genus can be distinguished from other genera in the subfamily by the following combination of character states: face coriaceous and matt, often covered with distinct punctures, without vertical impressions, black except for longitudinal stripes along inner orbit, and sometimes a median spot of face yellow in females, entirely yellow or black except for longitudinal stripes along inner orbit and a median spot of face yellow in males; clypeus with apical margin thin, flat or with a basal elevation; antenna without tyloids; mesoscutum with short and deeply impressed notaulus present on anterior half of mesoscutum, smooth and polished, strongly punctate, yellow shoulder marks present or absent; mesopleuron smooth and polished, covered with weak or strong punctures at least on lower half, rarely with some weakly coriaceous areas; epicnemial carina complete ventrally; propodeum with a full set of carinae or reduced in a few species (e.g., D. pectoratorius ( Thunberg, 1822 ) and D. neoalpinus Zwakhals, 1979 ); scutellum only carinate basally; fore wing areolet absent; hind wing with 2–4 hamuli; hind tibia white with an apical and usually also basal dark band, sometimes also with an orange or orangebrown apical band; female metasoma dorsoventrally depressed, more tapered towards apex in some species; T I to T III or T IV with distinct subapical transverse impressions; T I with distinct median dorsal carinae that usually surpass middle; T II and T III with spiracles dorsal, above lateral folds; metasoma black or with some tergites orange, or with yellow or whitish markings; ovipositor sheaths 0.30 times as long as hind tibia; males with T IX and T X fused as a syntergum, sternite IX about 1.50 ×wider than long, emarginated apically. Distribution. Afrotropical, Australasian, Holarctic, Neotropical, and Oriental regions ( Yu et al ., 2016 ).