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Looks like a few species of braconid wasp - but dead-wood is a difficult substrate because there are so many possible hosts associated with it. The obvious ones are wood-boring Symphyta but also wood-boring beetles and even just invertebrates that overwinter under the bark, like spiders etc. The species with longer ovipositors are more likely to have come from hosts burried deep in the wood, while the others might have attacked hosts nearer to bark level. Nice photos though :)