The following is the original description by Boulenger (1906):
Tongue with a conical median papilla. Head moderate, as long as broad; snout rounded, as long as the eye, Wilh distinct canthus and nearly vertical loreal region; nostril equally distant from the eye and from the end of the snout; interorbital space broader than the uppur eyelid; tympanum very distinct, two fifths the diameter of the eye. Fingers very unequal in length, first and fourth much shorter than the second, which is barely half the length of third (male), the tips dilated into small but very distinct disks; toes slender, nearly free, with a very slight rudiment of web, the tips dilated into rather large disks;j subarticular tubcrcles small and moderately prominent; a small, oval, inner metatarsal tubercle, measuring about half the length of the inner toe. The tibio- tarsal articulation reaches between the eye and the tip of the snout. Skin smooth. Olive-brown above, with a greyish-white, dark-edged streak on each side of the back, beginning behind the upper eyelid and converging towards its fellow on the scapular region; a greyish streak round the snout, above the canthus, and a broader band of the same colour, forming a very open chevron, across the interorbital region; limbs with ill-defined dark cross-bars; sides of head body, and limbs with white dots; lower parts white, throat brown. Make with a subgular vocal sac.
From snout to vent 21 mm.
A single specimen from Zima.