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I based my ID of verbekei on the Fauna Ent. Scand. key by Rozkosny (1984), that mentions a more strongly curved posterior crossvein for zernyi and less strongly curved for verbekei. The accompanying figures are quite clear. However, looking at the wing figures for the same two species in Rozkosny's Palaearctic key (1987), they seem to be reversed. The kley does nt mention the crossvein, neither is the crossvein mentioned in some of the later keys I have seen. The characters mentioned in those keys are not visible in this picture. So, that leaves us with Psacadina sp.