The Golden Langur is distributed on the border of Bhutan with India and it was discovered and described as recently as 1955.
There appears to be some doubt about this particular sub-species T. geei bhutanensis which was described in 2003. (Wangchuk, T., Inouye, D. W. and Hare, M. P. 2003. A new subspecies of golden langur (Trachypithecus geei) from Bhutan. Folia Primatologica 74: 104-108.)
In his book Mammals of Bhutan, Tashi Wangchuk mentions that this sub-species is found to the north of its area of distribution in Shemgang and Trongsa while the nominate sub-species is found further south along the border with India.
However Tashi Wangchuk notes that in the area around Shemgang recent surveys have found a hybrid zone where Capped and Golden Langurs are inter-breeding. These photos probably show such hybrids.
Noel Rowe of Primate Conservation Inc. sent me the following comments from Doug Brandon-Jones who did his PhD on leaf-monkeys or langurs: "The photo of T. geei bhutanensis (nomen nudum) is interesting and strongly endorses the view that the latter is merely a hybrid or intermediate population between T. pileatus [Capped Langur] and T. geei. I would probably have identified it as T. pileatus ?durga or brahma, were it not for the almost white cap and tail. If I am right in equating Shemgang with Shamgong, it is right at the eastern distributional limit of T. geei in central Bhutan, with T. pileatus beyond the next river to the east.
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