Onychrgia atrocyana (Selys, 1865)
Species: Onychrgia atrocyana (Selys, 1865)
Common name: Black Marsh dart
Habitat: Lakes, ponds, forest patches
Distribution: Dhaka, Sylhet
Flight season: March- November
Most of the damselflies of Bangladesh are very colorful, particularly the males. However, unlike many other damselflies Onychrgia atrocyana are black in color. But this unique color has makes it distinct from the other species.