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Hi Black

Yes this is a Stongylophthalmyid - the little family with a big name. there are only 2 Palearctic species S.ustulata which I think thisa is, and the rarer S. pictipes which I have only taken specimens from Finland and Russian Karelia, from memory it has darker setae on the thorax and a more pronounced apical cloud on the wing than ustulata. Both species are part of the saproxylic Diptera fauna associated with old aspens ........... Iain