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Unless there is something very similar in the east, this is undoubtedly S. subcoleoptrata male. As in other Phasia, sizes, shapes, wing-patterns and colors vary. This one looks like it has been swimming in some liquids that might influence the color of the abdomen?

In Finland this species occurs early in the spring in sandy areas; most specimens I've seen are from warm pine ridges or sand pits. Obviously it can be numerous in good locations (almost 30 exx from one malaise trap). I haven't collected any specimens myself yet, although trying quite hard to find the species. If I understand right, this species is deemed extinct from Sweden.