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Psylla cf. foersteri
Family: Psyllidae

One of several bright green species whose determination is difficult. The forewings are slightly yellow (best seen against a white background, but discernible here near the apex), and the pterostigma rather short, its margin concave.

The precise wing venation pattern, together with the short, broad genal cones are distinctive. The head is short and wide (impossible to confirm from this photograph).

Said to be common throughout the UK on alder.

Adult: ?
Length 3 mm
undetermined psyllid
Adult: south London (August 2007) ©Joe Botting