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Originally Posted by
Geoff F
Robber Flies do appear quite similar, Richard, but they tend to have distinctly hairy legs.
The question with your fly, Rudi, is - does the wing have dark markings as well as the stigma? Well the stigma seems a little odd and the darkening is more general than in streaks, but it is definitely darkened. So that points to R. scolopaceus or strigosus. The simple difference (if there is such a thing) between those two is that the arista hair on the end of the third antennal segment is central in strigosus but offset in scolopaceus, which means placed at the bottom of the third segment (viewed from side) and there is a slight elongation of that segment.
As far as I can tell from that image, the third segment is offset which clearly makes it R. scolopaceus.