 The oldest record is that of a specimen supposedly taken near Pontianak before 1850.Verifiable records exist from Burong Island, Sarawak (1899), Saya in the Lingga Islands (same year), Simeulue (e.g.Teluk Dalam and Teluk Labuan Bajau, 1901), South Pagai (1902) and Sipura in the Mentawai Islands, the Riau Islands (several times), Tuangku Airdingin (1913), Jemaja Andriabu in the Anamba Islands (1925), the North Natuna Islands (1928), and in Sumatra's Jambi and possibly South Sumatra provinces.