Libelloides sibiricus (Eversmann, 1850)

Figs 1, 2

MATERIAL EXAMINED. Russia, South Yakutia, Aldan River valley, vicinity of Ugino village (58°40′56′′ N, 128º31′13′′ E), 264 m, 25.VI 2025, 1 ♀, leg. L. V. Kuznetsova.

DISTRIBUTION. East Siberian-Far Eastern species, in the south of Siberia it is known in the Altai Mountains, Khakassia, Krasnoyarsk Krai and Irkutsk Region (Danilov, 2014; Shilenkov, 2020). In the south of the Russian Far East this species is recorded from the Amur Region, Khabarovsk and Primorsky Krais, and outside of Russia it is recorded from China and the Korean Peninsula (Makarkin, 1995). In the south of East Siberia, this species is confined to steppe and forest-steppe landscapes. In the upper reaches of the Yenisei, it inhabits meadow steppe, open areas, clearings in dry forests, mainly in river valleys (Danilov, 2014; Dmitrienko & Borisova, 2022). In the Irkutsk Region this species is found in the Priangarian forest-steppe and in the steppe areas of the southwestern coast of Lake Baikal to Priolkhonye (Shilenkov, 2020).

REMARKS. In Southern Yakutia, the species was found on the right bank of the upper reaches of the Aldan River on a hill in the lower part of a steep carbonate petrophytic slope of eastern exposure with a slope of 20–25º, at an altitude of 264 m above sea level. The insect was collected from Youngia tenuifolia (Willd.) Babc. et Stebb. (Fig. 2), growing in a pine with Dahurian larch shrub-herbaceous forest (Fig. 3). The imago flies from late May to early July, and is active during the day.