Abstract
The paper provides the first reliable record of Orthosia ariuna Hreblay, 1991 (Lepidoptera, Noctuidae) from the Far East of Russia. Between 18 April and 9 May, 2020 three males and a female of this species were collected in the city of Khabarovsk (district “kvartal DOS (Bolshoi Aerodrom)”), Khabarovsk Krai. The research provides a morphological description of O. ariuna, illustrations of the species habitus and male and female genitalia, and a distribution map. The author highlights the features that distinguish this species from related ones, particularly from O. incerta, which is found sympatricaly. In addition, the paper includes information about a little-known species O. ryrholmi G. Ronkay, L. Ronkay, Gyulai et Hacker, 2010 from the city of Khabarovsk, collected together with O. ariuna.
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