4. Opazon parvulum (Haliday, 1857) Figs 4, 7, 12, 16, 19. Belyta (Opazon) parvula Haliday, 1857. Opazon parvulus Chemyreva, 2019: 37 (erratum). MATERIAL EXAMINED. Estonia. ♂ (TUZ): Külasema, 58.6398°N 23.161°E, 22.VI.2016, V. Soon leg.; ♂ (TUZ): Abruka, 58.159°N 22.517°E, 27.VII.2017, V. Soon leg. Ukraine. ♂ (ZIN): Donetsk Area, “Khomutovskaya Step’” Nature Reserve, 17.V.1974, D. Kasparyan leg. Russia. ♀ (ZMUM): Kaliningrad Area, Kurshskaya Kosa (= Curonian Spit) National Park, 55°09’16.83'’N, 20° 51’27.03'’E, 24.VII–4.VIII.2006, V. Kolyada leg.; ♀ (ZIN): Republic of Karelia, Keret’ Village, 14.VIII.1980, N. Storozheva leg.; 2 ♀♀, 7 ♂♂ (ZMUM): Belgorod Area, near Shebekino, 3.VII.1988, V. Kolyada leg.; ♀ (ZMUM): Belgorod Area, Alexeevskiy District, 25.IX.1987, V. Kolyada leg.; 3 ♂♂ (ZMUM): Moscow Area, Moscow City, Bitsa Park, 1–10.VI.1994, V. Kolyada leg.; ♂ (ZMUM): Lyubertsy Distr., Kraskovo Station, 28.VII.2007, K.Tomkovich leg.; ♀ (ZIN): Samara Area, Kinel’ District, near Domashka, 18.VIII.2008, V. Chemyreva leg.; 4 ♂♂ (ZIN): Chelyabinsk Area, Ilmenskiy Nature Reserve, 13–18.VII. 1958, V. Tobias leg.; ♂ (ZMUM): Krasnoyarsk Prov., Taymyr Peninsula, Agapa River, 13.VIII.1973, V. Zherikhin, I. Sukacheva leg.; 5 ♀♀, ♂ (ZMUM): Republic of Yakutia, Srednekolymsk, 154°E 67°30’N, 18.VI– 13.VII.1991, V. Alekseev leg.; 2 ♂♂ (ZIN): Republic of Yakutia, Troitskoe, estuary Olekma River, 9 and 12.VII.1970, D. Kasparyan leg. Armenia. ♂ (ZIN): Erevan, 17.V.1971, D. Kasparyan leg. VARIATIONS. Body dark brown to pale brown; radial vein partly obliterated to distinct at apex, 1.7–2.6 times as long as marginal vein (the development of radial vein might be discordant in the same specimen [Macek, 1995]); mandibles 0.7–0.8 times as long as pleurostomal distance. Female A5–A8 subquadrate to elongate, A9–A14 as wide as long to transverse. DISTRIBUTION. England, Finland, Sweden, Germany, Poland, Czech Republic, Slovakia, Austria, Hungary, * Estonia, * Ukraine, Russia (European part, *Ural, Western and Eastern *Siberia), * Armenia, Japan.

Published as part of Rechnitzer, George, 2021, Review of the genus Opazon Haliday, 1857 (Hymenoptera: Diapriidae: Belytinae) in the fauna of Russia, pp. 78-83 in Russian Entomological Journal 30 (1) on page 82, DOI: 10.15298/rusentj.30.1.09, http://zenodo.org/record/10978399