The Latin species name fagi, meaning of "beech" (=fagus), refers to the prevailing species of trees in the relating biotope.

• Hipparchia fagi tetrica Fruhstorfer, 1907^[2]

This widespread European endemic species can be found in most of Europe, mainly south of the Alps^[2] (Albania; Andorra; Austria; Bosnia and Herzegovina; Bulgaria; Croatia; Czech Republic; France; Germany; Greece; Hungary; Italy; Macedonia; Montenegro; Portugal; Romania; Russia; Serbia; Slovakia; Slovenia; Spain; Switzerland; Ukraine).^[4] It occurs on broad-leaved deciduous forests, coniferous woodland, grassy vegetation, in woodland glades and woodland rides and, from sea level to 1,600 m elevation.^[5]

Hipparchia fagi has a wingspan of 66–76 millimetres (2.6–3.0 in).^[6] These large butterflies have dark brown uppersides of the wings, with a fringed margin, a white submarginal band more evident in the females and one black eyelet at the apex of each forewings. In the males the white band has a single very small eyelet on each hindwing, sometimes showing a white pupil, while in the females it shows one or two ocelli.^[7]

The underside of the forewings is rather similar to the upperside: The hindwings are marbled of brown and white with a broad white band. The white band on the internal edge of the underside hindwings is curved, while the white band on the underside forewings is often without a significant indent.^[8]

The colouration and pattern of these butterflies are an excellent camouflage on the bark of the trunks where the butterfly usually rests, with the eyespots hidden by the closed wings.^[5] This species is similar but larger than Hipparchia hermione. It is also rather similar to Hipparchia syriaca and Hipparchia genava.

The caterpillar has a pale brown head with four darker streaks. Body is light brown with a bifid posterior end, a dark brown dorsal band and brownish lateral bands.^[9]

•  
  female
•  
  courting - female on the left
•  
  mating - female on the right

•  
  Female
•  
  Female underside
•  
  Male
•  
  Male underside

Adults fly from June to September.^[6] This species has one generation a year. The caterpillars overwinter. The larvae feed on various types of grass, such as Brachypodium pinnatum, Bromus erectus, Festuca rubra, Holcus lanatus and Holcus mollis.^[2][5]

• Kudrna, O. (1977): A Revision of the Genus Hipparchia Fabricius. — 300 S., Faringdon – London
• Kudrna, O., Harpke, A., Lux, K., Pennerstorfer, J., Schweiger, O., Settele, J. & M. Wiemers (2011): Distribution atlas of butterflies in Europe. – 576 S.; Halle a.d. Saale
• Lionel G. Higgins et Norman D. Riley, Guide des papillons d'Europe, Delachaux et Niestlé, 1988, (Lausanne).
• Tom Tolman, Richard Lewington, Guide des papillons d'Europe et d'Afrique du Nord, Delachaux et Niestlé, (ISBN 978-2-603-01649-7).

• Paolo Mazzei, Daniel Morel, Raniero Panfili Moths and Butterflies of Europe and North Africa
• Larvae of North-European
• Lepiforum.de