::Yes, you are right. I was thinking black mambas and their black mouth and from the green color of the spotted bush snake i wrote green mambas. It comes from Africa, i will try to contact that person that have send them to me to ask him from which region they come. I have add 2 more pics. I hope they will help.
::Is this a spotted bush snake (Philothamnus senivariegatus)? It's mouth is black from inside like green mambas.
:Actually, green mambas don't have black mouths, only black mambas do.
:The snake certainly looks like a Philothamnus. Do you have any info on locality of origin (even just the continent would help)?