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Trombidium
Fuzzy, brilliant red insect, about 1.5 cm long, crawling on rock.
Sonoran Desert, rocky hillside.
I mis-identified this as an ant or wasp, at first, but thanks to suggestions, I see that it is really a mite.
I agree with you, John, about it not being a velvet ant. Its proportions are more like a spider than an ant, and it was totally red, including the legs. I'll have to look up "spider mites" and see how they match. Thanks for the suggestion!
Ido not believe that to be a velvet ant or cow ant. Even if it was a young ant the proportions would be different. Mutillidae do not have red hair on their legs.