Thymelicus leonina is a small butterfly found in the East Palearctic ( China, Amur, Ussuri, Japan) that belongs to the skippers family.

Description from Seitz

Male with stigma. Wings above light reddish yellow, all the veins striped with black; border of hindwing broader. On the underside all the veins are heavily black (87 f). Amur and Japan.Seitz, A. ed. Band 1: Abt. 1, Die Großschmetterlinge des palaearktischen Faunengebietes, Die palaearktischen Tagfalter, 1909, 379 Seiten, mit 89 kolorierten Tafeln (3470 Figuren)

See also List of butterflies of Russia

References