Tetraponera rufonigra, is a species of ant belonging to the subfamily Pseudomyrmecinae.
It is distributed across Southeast Asia Commonly called the bi-coloured arboreal ant, they are arboreal and build small nests which are excavated holes usually in dried parts of trees.
They are active hunters and hunt small insects.
They have a well developed sting and when stung can cause allergic reactions in human beings.
[1] The ant is known as "Hath polayaa" in Sinhala.