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Sorry for the inconvenience, but I think I made a mistake. A Sciaridae larvae may also be one of the possibilities. I have edited the head capsule of the norwegian specimen and this is what I mean by a hole in the headcapsule. In the next reply you'll see what is meant from the publication by Smith (1989). In Sciaridae there is a complete or nearly complete posterior tentorial bridge (p.t.b), which is lacking in Mycetophilidae. In Sciaridae larvae it seems as if there is an extra hole. So the mistake is, that I thought this was present in Mycetophilidae, but it isn't. So If you see this hole and the ptb, and I think this is present in the Norwegian specimen, then it is a Sciaridae. If not then it is a Mycetophilidae.
Sorry for my mistake.
Ton