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A distinctively coloured genus with several very similar species in which both the inner margin and corial-claval suture are darkened. Although K. smaragdula is the most common and widespread, the others can only be separated on microscopic features. There may be more of a tendency for the sides of the scutellum to be pale in this species than in the others, but this has not been confirmed.
Found across the UK, predominantly on alder, but also reported from birch and willows.
Adult: June to September
Length 4-4.5 mm
Huddersfield (June 2008) ©Joe
Huddersfield (June 2008) ©Joe Botting