Stenus pseudoboops PUTHZ, a staphylinid beetle new to the Polish fauna, was found (5 males) on 30 VII 1998 on the high moor, in the ecotone zone between the small water body and the surrounding peatbog. Locality: Góra Kowlikowa (UTM EB90, 22.24E 50.38N), near Janów Lubelski (eastern Poland). Figures of habitus and aedeagus of S. pseudoboops are presented.