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Snow "spiders"

I often go ski touring in the mountains around Vancouver, BC, and occasionally in the BC interior. Every day or two that I'm out I see insects in the snow which resemble spiders, except that they have only three pairs of legs. Their legspan is about an inch.

I had a friend who worked as a caretaker at mountain cabin who swore that they could be used to predict the weather, that they could tell when the next snowfall was coming and would crawl to the surface of the snow so they wouldn't be too deeply buried. He said he'd been told these are Grylloblattidae, but when I look these up they appear to be rock crawlers that live in the high mountains, and none of the variants have long legs.

Can any of the wiser folk on this forum help me identify these?

Thanks, Andy

It would help if you could post a photo. In the meantime, how about these guys:

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