Class Mammalia Linnaeus, 1758 - mammals Order Primates Linnaeus, 1758 - primates Family Cercopithecidae Gray, 1821 - Old World monkeys Subfamily Colobinae Jerdon, 1867 Genus Trachypithecus Reichenbach, 1862 - brow-ridged langurs, leaf monkeys Subgenus Trachypithecus Reichenbach, 1862