5, Hercostomus angustus, holotype; 6, 7, Hercostomus chetifer; 8-12, Hercostomus griseifrons, lectotype; 13, Hercostomus nanus (5, 6, 8, 13- hypopygium, lateral, 7, 12- cercus, ventral, 9- hypopygium, ventral, 10- surstyli, lateral, 11- phallus, ventro-lateral).