Erebia kefersteinii (Eversmann, 1851) Specimens: 9\Terensug headwaters, 10♂, 3♀; 10\Terensug, 2♂; 14\Sayanskiy Pass, 1♂. Remarks: Isolation of subspecies in this species is not so convincing; for the eastern principle slope of the Kusnetskoe Alatau Mts, where the Terensug River flows, the subspecies E. kefersteinii otteni Murzin et Sinjaev, 2003 was reported (Gorbunov, Kosterin 2007). Observations: Kosterin (2007) discussed occurrence of this species in the forest belt in this area but mostly above the tree line in Altai. On our expedition we observed the species in both environments, but at the Sayanskiy Pass only one individual was found, at a flowery patch by melting snow.

Published as part of Kosterin, Oleg E., 2023, Early summer aspect of butterflies (Lepidoptera: Papilionoidea) of Republic of Khakassia as examined in 2000, with some additional data, pp. 325-354 in Amurian Zoological Journal XV (2) on page 350, DOI: 10.33910/2686-9519-2023-15-2-325-354, http://zenodo.org/record/12816849