Presbytis melalophos melalophos
Sumatran Surili or Mitred Leaf Monkey, locally known as Simpai. This subspecies is the Yellow-handed Mitered Langur. Seen throughout the Kerinci area, but this photo was taken in the Bento Swamps, Kerinci Seblat National Park, Sumatra, Indonesia.
Sumatran Surili vary widely in color across Sumatra, depending on the region.