Discovery of M iller's G rizzled L angur ( P resbytis hosei canicrus ) in W ehea F orest Confirms the Continued Existence and Extends Known Geographical Range of an Endangered Primate

M iller's G rizzled L angur ( P resbytis hosei canicrus) is one of the least known and rarest primates in B orneo. With a limited geographic range along the central coast of E ast K alimantan and the highly degraded K utai N ational P ark, its former stronghold, this subspecies is now extremely rare and has been listed as one of the world's 25 most endangered primates. From J une 6 to A ugust 2, 2011, we carried out both direct observation and camera trap surveys at two mineral springs (sepans) in the W ehea F orest, E ast K utai district, E ast K alimantan. P resbytis hosei canicrus was observed at the large sepan on 3 of 6 observation days and at the small sepan on 2 of 3 observation days with up to 11 individuals observed in a single day at a single site. Camera traps recorded a per day capture rate of 0.72 at the small sepan and 0.25 at the large sepan and a per photo capture rate of 0.50 and 0.005, respectively. These data suggest relatively frequent occurrence of P . h. canicrus at the sepans, but the langurs are rarely encountered elsewhere in the W ehea F orest. The discovery of P . h. canicrus in the W ehea F orest confirms the continued existence of this endangered primate and is the first solid evidence demonstrating that its geographic range extends further inland than previously thought. It is not known whether the population of P . h. canicrus within W ehea F orest is large and stable enough to be considered viable, but it is likely part of a larger population that may possibly occur across surrounding protected forests and logging concessions. Surveying this potentially large population, and securing its protection, should be a priority measure for ensuring the continued existence of P . h. canicrus .