The article presents faunistic data on 85 species of Coleoptera new to the Estonian fauna. Most of the material has been collected within the framework of various research and monitoring projects carried out in Estonian nature reserves (1998-2009). A new type of trunk window trap, designed by the author in 2004 mainly for monitoring purposes, has been successfully used. 17 of the 85 species are new for the fauna of whole Baltic region: Pseudeuglenes pentatomus (Ths.) (Aderidae), Caenocara subglobosum (Muls. & Rey), Xyletinus tremulicola Y. Kangas (Anobiidae), Choragus sheppardi Kirby (Anthribidae), Cryptocephalus saliceti Zebe (Chrysomelidae), Dirrhagofarsus attenuatus (Mäklin), Hylis cariniceps (Rtt.), Microrhagus emyi (Rouget) (Eucnemidae), Gnathoncus communis (Marseul) (Histeridae), Notolaemus unifasciatus (Latr.) (Laemophloeidae), Agathidium discoideum Er. (Leiodidae), Anisoxya fuscula (Ill.) (Melandryidae), Mordellistena neuwaldeggiana (Pz.) (Mordellidae), Ripidius quadriceps Abeille de Perrin (Rhipiphoridae), Lissodema cursor (Gyll.) (Salpingidae), Aphodius quadrimaculatus (L.) (Scarabaeidae) and Eutheia schaumii Kiesw. (Scydmaenidae). One of the species, Caenocara subglobosum (Muls. & Rey) (Anobiidae), is new for the whole Northern Europe. Specimens of this species were collected from eastern and southern Estonia: most were caught in window traps but some also emerged from the collected fruiting bodies of Common Puffball (Lycoperdon perlatum). For 21 new species, Estonia lies on the northern edge of their range. Three of these, Triphyllus bicolor (F.), Mycetophagus ater (Rtt.) and Glischrochilus grandis (Tournier) that were collected from 6-10 sites, have a wider distribution in Estonia. Two species, Xyletinus tremulicola Y. Kangas (Anobiidae) and Stephanopachys linearis (Kug.) (Bostrichidae), have been listed on Annex II of the EU Habitats Directive. Two new species (Lymantor aceris (Lindemann) and Xyleborinus saxesenii (Ratz.)) were also added to the list of Estonian bark beetles (Curculionidae: Scolytinae).
