Lithophane socia (Hufnagel, 1766) E.Siberia, Irkutsk province, Ust-Orda envir., Kharat, at light, 10-V-2002, leg. O.Berlov The forewing length is 18 mm. det. E.Berlov E.Siberia, 10 km E Irkutsk, at light, 4-VI-2006, leg. E.Berlov The forewing length is 18 mm. det. A.Matov