Gray Langur Small 232×320 Medium 465×640 Large 744×1024 Download Tiff Original 1743×2400 | (1.5 MB) Description The Northern Plains Gray Langur (Semnopithecus entellus) is a primate in the Cercopithecidae family of Old World monkeys. Keywords common langur, entellus langur, hanuman langur, kmonkeys, northern plains gray langur, old world monkey, Semnopithecus entellus, wandura Galleries Mammals: I-L, Monkeys Source: William Dwight Whitney The Century Dictionary: An Encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1911)