Endemic to the island of Borneo where it’s restricted to southern and western parts of the state of Sarawak, Malaysia with a handful of populations across the border in Kalimantan Barat (West Kalimantan) province, Indonesia. Type locality is ‘Small peat swamp forest, 2.55 kilometers south of Batang Rejang ferry on road from Sibu to Kuching, Sarawak, East Malaysia, 2°08’N, 112°00’30″E’. According to Tan and Ng (2005) its range in Sarawak extends from Sibu southwest to Kuching and onwards as far as Matang. It’s been collected at several different localities and these populations are often labelled by collectors and enthusiasts to maintain accuracy and preserve pure bloodlines, e.g., Sibu, Matang. Apparently the greenish lateral blotch varies in size according to collection locality, with specimens from Matang exhibiting a much larger spot than those collected around Sibu. Many habitats around the former have disappeared as much of the zone has been turned over to housing projects.
