There are two different stocks of tiger hissers out there, the first may be the least common but it's been in the USA for about fifteen years and is an original, untainted stock from Madagascar. The colorations of this stock has always been consistent. The second is the variety from Europe and arrived here only in the last few years, it looks a little different and supposedly has variable coloration (may throw black or normal color forms). The stock from Europe may be a cross of different species if the black 'princisia' 'normal' 'tiger' were kept together (many hissers have the same male genitalia and may well cross), may be a different species from the same area (geographic color similarities across different species is common in arthropods) or the same species from a different area.