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True, but Clovis is right that it is really tricky.
First of all, always compare males with males and females with females, since females generally have darker wings than males.
Second, the variability in this group is bigger than generally excepted.
Thirdly, your identifications are correct.

Unique for scolopaceus (together with latipennis) is the dark spot below the stigma, at the fork of vein R4+5. This spot is lacking in vitripennis and also in strigosa.

As for your question, I need to look into that. Interesting observation.


Theo