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I think it is P.straminea:
Sometimes P.straminea has spots on wings
https://ccw.natur...-male3.png
I have several specimens in collection with spots and I have checked genitals.
P.littoralis is not yet catched from Finland.
P.straminea is rather anaemic yellow, P.littoralis is orange-brown.
P.straminea has strongly black apex to the femora.

BR Esko