InsectNet forum

The Joker butterfly. Recto & verso male specimens
Uganda.

Byblia ilithyia (note the "i" after the "y") is known as the Spotted Joker (because of the dorsal HW discal row of spots). The other species in the genus, Byblia anvatara, the African Joker, lacks those dorsal HW spots.

Here's Byblia anvatara crameri:

I should also add the ventral HWs on both species are really variable. So much so, that they can't be distinguished based on the ventral HW alone.