The invertebrates (Isopoda, Diplopoda, Pseudoscorpiones, Opiliones) from Mazurian Lake Region were studied. At present 11 species of Isopoda, 15 of Diplopoda, 10 of Pseudoscorpiones and 17 of Opiliones are known from this region.
The Coccinellidae beetles have been studied in Białowieża Primeval Forest. Based on the collected material and literature data, 51 species of this family have been recorded from the area. The following species are new to this area: Hyperaspis reppensis, Nephus bipunctatus, Scymnus abietis, S. ater, Harmonia axyridis and Vibidia duodecimguttata.