Heliogomphus promelas

Its thorax is black on dorsum, and greenish-yellow on sides.

Abdomen is black, marked with pale greenish-yellow.

There is a narrow mid-dorsal stripe extending from segment 1 to 5.

Superior anal appendages are black at base, pale green to yellow at the apices.

[5] It is commonly found as small colonies on small mountain streams, tiny brooks and seepage on hillsides.