A new bush frog of the Philautus aurifasciatus group is described from the montane forest of the karst mountain Gunung Api in the Gunung Mulu National Park, eastern Sarawak, Malaysian Borneo. The new species was hitherto assigned to Philautus longicrus, but differs from this species in snout length and shape, head length, hand length, snout proportions including internarial distance and relative position of the nostril, interorbital distance, eye diameter, nuptial pad shape, and the absence of a row of small, low white tubercles along the edge of the lower jaw. The advertisement call of the new species is described and compared to the calls of all other Bornean members of the P. aurifasciatus group.
Key words. Amphibia, Anura, Rhacophoridae, Philautus juliandringi sp. n., Philautus longicrus, Sarawak, Palawan, advertisement call.
J. Maximilian Dehling. 2010. A New Bush Frog (Anura: Rhacophoridae: Philautus) from Gunung Mulu National Park, East Malaysia (Borneo). SALAMANDRA. 46(2); 63–72.