Status: - Usually very localized, found mainly to the west and south of England and Ireland and throughout Wales. Disconnected populations can be found in the Lake District and West Scotland.
Habitat: - Frequents streams with sand and fine shingle substrate. Flow rates are medium to fast and the streams can be quite deeply cut. Tolerates more shade than C splendens, it is often found in wooded glades through which a suitable water body passes. Also found on streams passing through farmland, heathland, and moorland.
Flight period: - Late May to late August.
General: - Where there is a suitable habitat crossover, this species can co-exist with C splendens. Males are territorial, using a particular bank side stem from which to guard their territory. A threat display is achieved by opening and shutting of the wings. Where population densities are high, males without territory adopt a different strategy, more an opportunistic snatch and grab. Copulation is preceded by an aerial display, acquiescence on the part of the female results in rapid copulation (2 minutes plus). The female proceeds to egg-lay with the male perched on guard or hovering somewhere nearby.