Abstract
Palaearctic species of the sequester group of Pteromalus Swederus, 1795 are reviewed. Three new species, P. boleensis Yan, Li & Tselikh, sp. nov. (Kazakhstan, China), P. longipedicellus Yan, Li & Tselikh, sp. nov. (China) and P. oscolensis Tselikh, sp. nov. (Russia, China) are described and illustrated. Types of P. cionobia (Erdös, 1953) and P. sequester Walker, 1835 are redescribed. An identification key to females of the sequester group of Pteromalus is given.