Abstract
Abstract: A monkey population allied to Francois' leaf monkey Trachypithecus francoisi discovered in 1920 constitutes the taxon laotum, endemic to Lao PDR. The next seven decades provided very little additional information about it. Wildlife surveys in the 1990s found a large population of T. (f.) laotum in Phou Hinpoun (=Khammouan Limestone) National Protected Area (NPA) and north into southern Nam Kading NPA, and a large population in and around Hin Namno NPA of T. (f.) ebenus, known outside Lao PDR only from adjoining Vietnam. Detailed here are confirmed records of smaller and more localized populations of leaf monkeys of the T. francoisi group (sensu Groves 2001, 2005, p. 175) from two other areas (Nakai—Nam Theun NPA and a region outside the protected area system, Muang (= District of) Vilabouli, in Savannakhet province), highly plausible reports from one more site, and records of T. (f.) ebenus from southern Phou Hinpoun NPA. Animals from Nakai—Nam Theun NPA and Muang Vilabouli differ in pelage from...
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