Favonius ultramarinus (Fixsen, 1887) MATERIAL. Russia: Kunashir Island, Danilovskii kordon, 15.IX 2022, 1 ♀. DISTRIBUTION. Russia: the southern part of Primorskii krai (Khasan Region). Not long ago, one male specimen was caught in South Sakhalin: Pionery (Asahi et al., 1999). In Japan, the species is distributed in Kyushu, Honshu and Hokkaido, including all northern coast (Hasegawa, 2020). So, the finding of this species in Kunashir is very expected. REMARK. Female genitalia structure is typical for this species.

Published as part of Dubatolov, V. V., Zinchenko, V. K & Ustjuzhanin, P. Ya., 2023, Autumn moths and butterflies (Lepidoptera) new for the fauna of Kunashir Island, pp. 11-24 in Far Eastern Entomologist 474 on page 20, DOI: 10.25221/fee.474.3, http://zenodo.org/record/7945971