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I suspect you are right, but dust spots are a tricky one with Melanostoma, as the shape of the frons of mellinum does appear to show broad dust spots at some angles.
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Many thanks again for your comments, Ian. I think, then, it would be best if I revise the Id to Melanostoma but no further.
Lat/Lng: 55.78898, -4.20168
OS grid ref: NS620572