I have seen females of Tetracanthagyna plagiata on just two to three occasions over the years of odonata hunting but not a single male. Only just recently, I have encountered a male individual resting in the heavily shaded foliage of the secondary forest in the nature reserves.
Males have wings that are long, and broad, and have dark brown costal streak, without the broad transverse dark brown patches near the wing tips of the females. Otherwise the general appearance of both males and females are very similar.
The pictures of the female can be found – here.