Borneo. Central Kalimantan, Bukit Raya and upper Katingan (Mendawai) River area. Upper Katingan river, c. 50-100 km WNW of Tumbang Samba. K.T.C. logging area; near central Base Camp; c. km. 55 W. of Batu Badinding. Alluvial ground along Sungei Gagu., Kalimantan, Indonesia, Asia-Tropical