| abstract | During a study of predatory mites of Western Siberia, 13 species of the family Stigmaeidae (Acari: Prostigmata) have been recorded from the Altai Republic, Russia. Stigmaeus akimovi sp. n. and Eustigmaeus summersi sp. n. are described as new to science. Mediolata uspenskii and Eustigmaeus acidophilus have been recorded from Russia for the first time and redescribed based on materials from Altai. Stigmaeus purpurascens, S. longipilis, S. sphagneti, S. delaramae, Mediolata pini, Eustigmaeus segnis, E. rhodomelus, E. parvisetus and Cheylostigmaeus sp. have been recorded from the Altai Republic for the first time. |