A short biography of O. CASTELLANI (born; Sept. 11, 1903, Tarquinia nr. Rome; deceased: Dec. 2, 1974, Rome; schoolteacher and founder of the Associazione Romana di Entomologia) is followed by a list of his odonatological publications (1936-1954), all of which are devoted to the Italian fauna. On December 2, 1974 the death occurred in Rome of OMERO CASTELLANI — one of the best known non-professional Italian odonatologists of the older generation. Although, due to his ill health, in the last years of his life he was unable to work in entomology, his contribution to this field in Italy is certainly worth noting.