In 1893, Gestro founded the genus Ceroplophana, only including the simultaneously described species C. modiglianii Gestro. He considered the genus — based on the only known specimen — closely related to Peperonota Westwood, Didrepanephorus Wood-Mason, and Dicaulocephalus Gestro. For rutelines, the males in these genera have strikingly developed secondary sexual characters. Gestro's species was the first representative from an insular locality of this South-East Asian group (Si Rambé, Batakland, North Sumatra; this locality is mentioned on the map in the report of the explorer who collected the material, Modigliani, 1891). Recently I could study seven ♂ of modiglianii from West Malaysia. They show striking differences from Gestro's description. Gestro's type specimen could not be traced in the Museo Civico di Storia Naturale at Genova (E. Tortonese, in litt.). Fortunately, Dr. Erber provided me with six ♂ and the Berlin Museum with one ♂ all from North Sumatra and collected partly in the same area as Gestro's specimen. Consequently a direct comparison became possible. The differences between the Sumatran and Malaysian specimens described and figured below appear to be constant. Both series include insects of varying size and correspondingly developed head armatures. The identical parameres and the general appearance suggest a close relationship, so only a subspecific rank seems justified for the West Malaysian form, which I name Ceroplophana modiglianii Gestro subsp. malaysiana (pl. 1). Due to the indicated differences the to be completed in several respects: Gestro: