Banded Demoiselle
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Calopteryx splendens
Common & widespread in Britain.
Male and Female are variable in color and pattern.
The Male has translucent wings which each have a broad, dark iridescent blue-black spot (or band) across the outer part.
On Immature individuals the spot is dark brown.
The dark wing patch of the ale starts at the nodus (the slight dip midway down the upper edge of the wing) but can reach up to the wing-tip in southern races.
In the very similar Beautiful Demoiselle (Calopteryx virgo), the dark patch starts before the nodus.
The Female has translucent, pale green iridescent wings with a white patch near the tip (a pseudopterostigma), and a metallic green or bronze/green body.
Flies from April-Early September.