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6.5mm, Moor Piece Wood, Clitheroe UK, 20 April 2011
On birch trunk.

This one flew before I had finished with the camera. Eutrichota seems right (the long pre-alar shows well), but I have no information about the arista. E. longimana could be a good fit (moderate size, heavy dusting, fore-femur dorsally darkened), but if the arista is haired it could perhaps be E. (Parapegomyia) socculata. The key (Ackland) says nothing about leg colour for this. Can anyone help please?