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I do have both. N. socius is one of the more common asilids in Finland, N. cyanurus is rather rare here.

In Finnish material these two species can normally be told apart by color color of tibiae. The tibiae of socius are reddish orange, often with large, ill-defined darker areas. N. cyanurus has bright yellow-orange tibiae with black confined to small apical band. In all specimens I've seen this character match with the microtrichia, but as it is a color character I'd be surprised if it wouldn't fail sometimes or somewhere.

Markus' fly appear to be typical N. socius.