See also:
Sylvia communis Latham, 1787
Sylvia communis communis Latham, 1787

No Synonyms

Description. Upper parts are more clear-grey (sometimes brownish tinged) less brown-grey than on communis. Crown is usually grey, rare brown tinged.

Distribution. Breeds in Tien Shan, Dzhungarskiy Alatau, Tarbagatay, Saur, Southwest Altai and Kalbinskiy Altai. On migration occurs in mountains foothills and in southern Kazakhstan.

References

Gavrilov E. I., Gavrilov A. E. "The Birds of Kazakhstan". Almaty, 2005
Э.И.Гаврилов. "Фауна и распространение птиц Казахстана". Алматы, 1999.