Dodia diaphana (Eversmann, 1848)

(Figs 2A, B, C, D, 3H, I, J)

Lithosia diaphana Eversmann, 1848: 212. Holotype ♂ (ZISP). Type locality: «im östlichen Sibirien, in der Gegend von Irkutsk » [Russia, Siberia, Irkutsk Oblast’].

Material examined. 1 ♂, [USSR], Chitinskaya Oblast’ [Zabaikalsky Krai], Saranakan Mountain, 2.VII.1955, leg. Kurentzov (FSCEATB); 1 ♂, [USSR], Altai, Kuraisky Range, near Aktash, headwaters of the Yarly-Yary River, 2700 m, alpine meadow, 8.VI.1974, leg. Yu. Kostyuk (FSCEATB); 2 ♂, Russia, Altai Republic, Ulagan distr., 11 km SE of Aktash vill., 1570 m, 50°15‘26.25“ N, 87°44‘5.40“ E, at light, 12–13.VI.2019, S.A. Knyazev leg. (RMBH); 1 ♂, [USSR], Buryat ASSR [Buryatia], Mondy village, Khulugaisha Mountain, 1800 m, 7.VII.1984, leg. Tshistjakov (FSCEATB); 6 ♂, 2 ♀, Russia, Khabarovsk Krai, Verkhnebureinsky district, Bureinsky Nature Reserve, Dusse-Alin Range, headwaters of the Pravaya Bureya River, Novyi Medvezhii cordon, 52°07‘56“ N, 134°17‘30“ E, 877 m, 30.VI–5.VII.2016, leg. Evgeny S. Koshkin (EKC); 6 ♂, same locality and collector, but 6–12.VII.2018 (EKC); 2 ♂, same locality and collector, but 9– 10.07.2020 (EKC); 1 ♂, Russia, Khabarovsk Krai, Verkhnebureinsky district, headwaters of the Niman River, Niman cordon, 52°08‘33“ N, 134°13‘20“ E, 1035 m, 7.VII.2016, leg. Evgeny S. Koshkin (EKC).

Diagnosis. Dodia diaphana is easily distinguished from other species of the genus Dodia by its yellow patagia and abdomen, which also has black spots. The wings are broad and dark gray, as is the thorax (Figs 2A, B, C, D). In the male genitalia, the uncus is widened at the apex. Valva narrow, its apex with two slender processes, the lower one usually larger and broader. The aedeagus is straight and slender. The vesica is short, with four short sac-like diverticula. A ventral diverticulum with a crest-like row of about 5–10 spines. Specimens from the mountains of Southern Siberia often lack spines, with weak sclerotization in their place (Figs 3H, I, J).

Distribution. Siberian and Far Eastern boreal species. In Russia, it is widespread in the mountains of South Siberia (from Altai to Transbaikalye and South Yakutia in the east) and the Russian Far East (Amur Oblast’, west of the Jewish Autonomous Oblast’, southern half of the Khabarovsk Krai, Primorsky Krai (Sikhote-Alin Nature Reserve), Magadan Oblast’, Kamchatka) (Sedykh 1979; Tshistjakov & Lafontaine 1984; Tshistjakov 1988; Murzin 2003; Rekelj & Česanek 2009; Dubatolov 2010; Šumpich et al. 2020). Also indicated for Northern Mongolia and Northwestern China (Murzin 2003).

Ecology. Prefers mountainous coniferous and deciduous forests.Also occurs in larch bogs and mountain tundra. Flight period from early June to mid-July. Males are mainly nocturnal, attracted by various light sources. Females in the Dusse-Alin Mountain (Khabarovsk Krai) were collected during the day. The preimaginal stages and larval host plants are unknown. The life cycle is probably two years. In the Dusse-Alin Range, adults are recorded only in even years, as in Dodia albertae.