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Thanks John.

As a relative newcomer, I'm surprised there aren't more Agromyzidae experts around. They are easy to find, including by collecting mined leaves, etc and in the UK at least there is the key in RES Handbook Vol 10 Part 5g. Diptera, Section (g) Agromyzidae by Kenneth A. Spencer, free to download from http://www.royens...-handbooks.

Regards,
Martin