For what it is worth, i have seen  interesting  specimens from Zanzibar
which look like a hybrid between arabica and tigris or possibly
pantherina.  One, which i may be able to get a photo of (if so, i'll
send to someone to post somewhere), had an extremely bizzare patern
dorsally- like an immanus that took a wrong turn somewhere, and
tigris-like patterning up the sides.  The teeth were pure immamus.
                                                                                -Ross M.