[3] Its specific name honours Malcolm Arthur Smith, one of the early herpetologists to study the amphibians of Thailand.

They have a relatively big, depressed head with striking eyes with upper half of iris scarlet or yellow.

Skin above is nearly smooth but with minute granules scattered behind, especially around vent; ventrally granular.

[2] Its type locality is Ton Nam Plu Waterfall, Khao Chong, in Trang Province, southern Thailand.

It may also occur in northeastern India and Bangladesh and in Peninsular Malaysia (Pulau Langkawi).