The paper contains results of a faunistic research carried out in 1992-1997 on Staphylinidae in Puszcza Borecka forest in north-eastern part of Poland. During the study 394 species of Staphylinidae were recorded. One of them Atheta pfaundleri was found for the first time in Poland. The results of faunistic and ecological research on the subfamilly Steninae were published in earlier papers.