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Would be good to hear from others if they agree this is Stenocorus meridianus, as it appears not to have been recorded in Scotland before! If you have any further photos showing different angles it would be very useful to see them (if you click on "edit", above, you should be able to upload further photos for this observation).
The larvae feed in the roots of dead/dying trees - was there anything of this kind nearby?
Entomologist and biological recorder
Can I just check whether the location should be Minnigaff, near Newton Stewart? If you click on the "minnigaff" location link, above, the green dot on the map is further north-east, near Lanark.
Apologies, I got that one wrong! I asked Martin Rejzek of the longhorn beetle recording scheme to look at it and he is sure it is the Two-banded Longhorn Beetle, Rhagium bifasciatum. This is present in Scotland, and has larvae in the dead wood of a range of tree species.
Lat/Lng: 55.6, -3.8
OS grid ref: NS8940