Diplazon Nees, 1819

Morishita, Shunsuke & Watanabe, Kyohei, 2021, -- Review- - of- - the- - genus Diplazon- - Nees, -- 1819 -- (Hymenoptera: -- Ichneumonidae Diplazontinae) -- from- - Japan, Zootaxa 4964 (1), pp. 103-122 : 104

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).