Mesochorus (Mesochorus) marginatus Thomson, 1886 (Fig. 24) syn. giberius sensu Schwenke nec Thunberg, 1822 Material examined. UKRAINE: lvano-Frankivsk Region: 1 ♀, Mochary, 5 km NE of Bogorodchany, 48.505117°N, 24.35.2691°E, 300–310 m, mixed forest, Malaise trap 1, 8–14.vi.2015; 1 ♀, idem, 21.vii–10.viii.2015; 1 ♀, Dibrova, 5 km SW of Bogorodchany, 48.772054 N, 24.511657 E, 310 m, oak forest, sweeping, 8.x.2013; 1 ♀, Gorgany, m. Syvulya, 12–13 km SW of Stara Guta, 48.531433 N, 24.132609 E, 1425 m, subalpine zone, sweeping, 14.vii.2012; Transcarpathian Region: 1 ♂, 2 ♀♀, Svydovets 2–3 km NW of Kvasy, 48.090889°N, 24.155835°E, 850–900 m, beech forest, Malaise trap 2, 7.v–5.vi.2014; 1 ♀, idem, 5–29.vi.2014; 1 ♀, idem, 14.vii–24.viii.2013; Transcarpathian region: 1 ♀, 6.5 km N of Mala Ugolka, 48.153958°N, 23.370084°E, 750 m, beech forest, Malaise trap 5, 12–31.v.2015; 1 ♀, idem, Malaise trap 6, 12–31.v.2015, leg. O. Varga; 1 ♀, idem, sweeping, 26–27.vii.1995, leg. A. Kotenko; 1 ♂, idem, on light, 16.v.2004; 1 ♀, Dilove, on light, 13.vi.2008; 1 ♀, idem, vii.2008; 2 ♀♀, idem, 7.viii.2008, leg. R. Bidychak; 2 ♀♀, Vynogradiv, oak forest, 280 m, 48.138338°N, 23.073689°E, Malaise trap 1, 17.v–10.vi.2017, leg. O. Varga (SIZK). Distribution. Holarctic, Neotropical and Oriental regions; first record for Ukraine. Taxonomical remark. This species was usually misidentified as Mesochorus giberius (e.g. Schwenke 1999: 75) in the past. It differs from Mesochorus giberius mainly by its darker mesosoma with extended black color pattern and shorter ivory spot on frontal orbit which do not reach the lateral ocellus in females (Vikberg & Vårdal 2017: 23–26).

Published as part of Riedel, Matthias & Varga, Oleksandr, 2022, A checklist of the subfamily Mesochorinae (Hymenoptera, Ichneumonidae) from the Ukrainian Carpathians, pp. 224-248 in Zootaxa 5100 (2) on page 237, DOI: 10.11646/zootaxa.5100.2.3, http://zenodo.org/record/6145438