Nice to see the image of this species. According to IUCN classification this is Semnopithecus hypoleucos and the geographic range is in "south-western India (Goa, Karnataka and Kerala), centred on the western ghats. It is found in Molem in Goa in the north to the periphery of Silent Valey in the south. The total range covers over 35,000 square kilometers".

IUCN also mentions that some experts believe that this is a hybrid between Nilgiri langur and grey langur. For more check: http://www.iucnredlist.org/details/39838/0

Vivek Menon in his book Indian Mammals, A Field Guide, writes "In Southern India, Nilgiri Langurs and the Grey Langurs are known to produce hybrids where their ranges overlap".