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Type locality of Hylobates concolor leucogenys

Kloss [1929] restricted the type locality of the northern white‐cheeked gibbon, Hylobates concolor leucogenys, on the basis of two specimens that were collected at Muang Khi, Laos, not at Muang Pak‐Lay, Laos, as conventionally assumed. The locality difference is zoogeographically important because Muang Khi is east of the Mekong River, within the known range of H. c. leucogenys, whereas Muang Pak‐Lay is west of the river, outside the known range of the subspecies. The type‐locality restriction is appropriately amended.