Sepia Dun
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Leptophlebia marginata
Common & widespread in Britain.
Flies from late April-early June.
They emerge from the aquatic nymph's final moult during daytime in early summer.
The final instar nymph crawls to the surface of the water, or climbs onto an emergent plant stem, a stick or a rock, its skin splits and it emerges as a winged Adult.
Males fly in swarms during the day.
Fertilized Females have about 1200 eggs and fly over the water, dipping the tips of their abdomens in the water to lay small batches of eggs, or landing briefly on the surface to deposit their eggs.