New data on the distribution of four species of genus Trox Fabricius, 1775 (Scarabaeoidea: Trogidae): Trox niger P. Rossi, 1792, T. perrisii Fairmaire, 1868, T. sabulosus sabulosus (Linnaeus, 1758) and T. scaber (Linnaeus, 1767) are reported from Bulgaria.