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This is a tough one! The female Rhaphium below is either appendiculatum or caliginosum. Fonseca's RES key to UK Dolichopodidae splits the two species on a very difficult wing vein character:

caliginosum: "cubital vein gently curving rearwards from about middle to near apex, where it becomes quite straight to wing margin"

appendiculatum: "Cubital vein, after curving rearwards to near apex, slightly curving forwards to wing margin"

I reckon it is appendiculatum, on the other hand it could be caliginosum, wait no, maybe it's appendiculatum, or could it be....

VERY DIFFICULT:@, so lets vote. What do others think?