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Thanks for the reassurance, Oxycera - I thought my pig-headedness must be irritating everone :o Now I can see myself as the grain of sand in the oyster stimulating the production of pearls of great price B)

Joke, Figure 44b in M of CE is of the hind tibia of C. flavicornis. It looks similar to this one, and the seta in question, which must be the one the key refers to as a posterodorsal, is labelled 'dorsal' in the diagram. This illustrates that a seta may be morphogenically posterodorsal but appear in a more or less dorsal position. Have I got the point?

We seem to have proved that this fly is either an anomalous individual or from a species not covered in the key (apart from being far outside its known range, emiliae doesn't seem to have f1 grey). I'll try to catch some more when they re-appear - I think I saw quite a few of these last summer. It's a pity it wasn't albicornis, because the description of the frontal triangle fits exactly, as does everything else in the description in my book, except that the fore-femur should be dark dorsally and yellow ventrally whereas this one looks grey all over. Oh, and it has a pd on t3 :D

Very many thanks, Joke. You can have your life back now :)

Stephen.