Clossiana dia (Linnaeus, 1767)
• TYPE LOCALITY. Austria.
• RANGE. From W. and S. Europe to the Far East, excluding the extreme North and Middle Asia.
• DISTRIBUTION AND VARIATION. The nominotypical subspecies occurs in the northern part of the range; the S. European part and W. Siberia are inhabited by the ssp. disconota (Krulikovsky, 1909); from the Caucasus and Transcaucasia, the ssp. calida (Jachontov, 1911) is known; the Dzhungarsky Alatau, the Altais, the Sayan and Transbaikalia are populated by the ssp. alpina (Elwes, 1899). The ssp. semota Tuzov, 2000 inhabits the Far East and display slight greyish dust on the UPS, especially in females.
• HABITATS AND BIOLOGY. Open landscapes up to 2,500 m a.s.l. Flight period: from May to September, in the southwestern part of the range in two generations. Host plants in Europe (Lang, 1884; Eckstein, 1913); Viola, Rubus idaeus, Prunella vulgaris.
• SIMILAR SPECIES. Clossiana titania: much larger. C. thore, C. selenis, C. angaren-sis: apical angle of HW rounded, not sharpened.
Photo and text: Guide to the BUTTERFLIES OF RUSSIA and adjacent territories Volume 2. PENSOFT, Sofia - Moscow. 2000