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Thanks Nigel and Gunter. Hairs on dorsal thorax are clear, on lateral thorax yellow, and those on the scutellum are white. The specimen is densely hairy and looks in pristine condition with no wear. Fading is an option but I would have expected to see evidence of wear - we do get very bright days here and it gets hot (in summer!).
Dorsal arista not plumose but bare.