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Wing length 5 to 6 mm. Fairly small and blackish in colour including the antennae. The wings are clear or only slightly shaded. The females often have a shining abdomen.
Rich marshes and watersides with emergent vegetation.
May to mid August peaking late May and June.
The larvae are aquatic.
Common and widespread in Britain.
Fairly common in Leicestershire & Rutland.
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