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unusual for tesselata, how are you excluding the very commom E. livida and other related species?
I see what you mean David. I hadn't noticed the brown/red legs.
Empis livida above on the balance of probability but there are other species it could possibly be, including the unusual red-legged form of tesselata.
Many thanks David.
Lat/Lng: 51.2699, -0.1453
OS grid ref: TQ294539