A catalogue of Lithuanian beetles (Insecta, Coleoptera)? is the first most comprehensive publication on Lithuanian beetle fauna. This volume provides a general overview of the main features of Lithuanian territory, the origins and formation of the beetle fauna and their conservation measures, the faunistic investigations in Lithuania to date revealing the most important stages of the research process. Basing on the published and interactive sources since 1830 the full lists of recorded and expected for Lithuania beetle species as well as enlarged list of references have been compiled in the catalogue. After revision of public beetle collections in Lithuania, the authors propose to remove 43 species from the beetle species list of the country on the grounds they have been wrongly identified or published by mistake. The information published in the monograph will serve to further research Lithuanian beetles.