Gromphadorhina portentosa has long been a widespread and popular species with stocks that range widely in color and are far more common than the related "species." While other hisser genera have different male genitalia except "princisia", this and other Gromphadorhina such as oblongonota, and grandidieri have long been known to science to have the exact same male genitalia as portentosa and probably do not even merit subspecific status, let alone full generic recognition in the one case. The point however I am trying to make is these less commonly kept variants have probably not tainted most portentosa stock since they are more recent arrivals and kept by a far smaller number of hobbyists. Those look like some portentosa seen before any of the other "species" were being kept in captive culture.