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Wriggling pupa found under bark in stump of Douglas fir (Pseudotsuga menziesii).
It is rather large: 13 mm long. Covered with mites.

Because of its size, i thought it might be Bibionidae, but i don't know if these occur in decaying wood at all. I will try to rear it.

Any suggestions?

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Louis,

What is the verdict? Did you rear it?

I would have to say that this is not a fly pupae. I would have to guess that it is belongs to some Coleopteran family, like Elateridae.
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Hi Totipotent,

It is a comforting thought that it was 'just' a coleopteran, because it died. You're right it should have emerged by now. It was going to emerge, and darkened already. Then a bunch of small coleoptera larvae that had been hiding in the substrate accompanied it. At first they seemed harmless to me, but the bastards did actually eat my pupa !