The significance of the penile features for the taxonomic separation of the 2 spp. is outlined, and the difficulties in the identification of the females are discussed. From among the Selysian specimens the lectotype of H. carnifex Hagen in Selys, 1854 is designated; it is described and compared with the specimens from Iguazti, Argentina. The distinctive characters of H. carnifex and H. proxima are stated, and their penile organs and appendages are illustrated. In addition, the paratypes of H. aurora Ris, 1916 were examined, and a figure of the penile organ is provided.