A good description is: "They're back in black."

I've upvoted this in earnest. Here's hoping it gets in.

I seriously need this so badlyyyy, I absolutely love black skins like this. Thank you so much Velociboy you are just great<3

Description sugguestions for all of them across the board:

Sleek black and dressed to kill

They may not be panthers but their far deadlier

These fellas will make sure you don't mess with their hood

(I may or may not think of more of them later)

Wow, this is a cool pack! It isn't even bad that the black jaguar rex takes the place of its rex since, as you said, it is already melanistc xP
I can't wait to see more pf the pack ingame :D