A large and impressive dragonfly
(male-74mm, female-84mm) , preferring acidic
rivers and streams of all sizes.
Males patrol a predetermined path close to the
surface along streams, the length of territory
being determined by the number present, decreasing
until a state of saturation is reached. They often
perch along the bank within a metre of the
surface, usually on a favourite twig or stem.
Females oviposit into the gravel substrate with
short, sharp stabs, frequently in shade. When
spotted by a resident male they usually couple and
fly or short distance to a suitable perch where
mating takes place over a 30 minute period.
Both sexes can be observed well away from water
within heaths, meadows and woodland rides.
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