Melitaea didyma (Esper, 1779):

W.Siberia, Altai Mts., Ongudai, 31-V-1908, leg. A.Jakobson (coll. SIFIBR) The forewing length is 20 mm. det. E.Berlov

This specimen from Central Russia is given for comparison: Russia, Kaluga Region, Kozelsk distr., Zhizdra river, forest near Sosenskyi, 2-VII-2004, leg. A.Elez The forewing length is 19 mm. det. A.Elez