Whichever langur taxon it is, I suspect it belongs to Semnopithecus - which the Golden Langur may or may not belong to, along with Pileated and Shortridge's Langur.
It look more like the core "entellus" group however.
it's probably an old specimen so the colour almost certainly can't be relied on.
I had wondered if Pygathrix entellus referred to this specimen rather than the one on the wall (you can't tell what that one is, nor whether there is another sign for it).
