BLACK-CRESTED SUMATRAN LANGUR Presbytis melalophos Geographic Distribution and Habitat Black-crested Sumatran langurs (Presbytis melalophos), also called mitered leaf monkeys, yellow-handed mitered langurs, or Sumatran surilis, are tree-dwelling primates from southwestern Sumatra—Indonesia’s largest island. They can also be found on Pulau Pini, a small island in the Batu Archipelago off the northwestern coast of Sumatra.These monkeys