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Paul,

Many thanks for that. I will keep ploughing through Meunier's monograph. Biggest problem with it was that he liked to illustrate antennae and not much else! Not helpful when the fossil does not show these well.

I am away for a few days. When I get back I will have to try to cut into the amber from the other side so as to expose the left side of the head and see is there is an antenna left on that side.

I should have said that the length of the fly is about 2.5 mm

Peter