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Hi andrewsi,

Your description and photo's agree with Tephrochlamys laeta (Meigen, 1830) material I have collected in the Netherlands. Also the quite small anterior dorsocentral. However, Andrzej Woznica might have something further to say about the exact definition of this taxon.
The size difference within T. rufiventris is also considerable, so that should not necessarily mean that this can't be T. laeta.

Kind regards,
Ectemnius