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Caterpillar. Mostly Black with Yellow spots down back and sides. Iridescent blue/green knobs covered with white hairs. red face? Approx 1.75 in long.
Found on ground brush in Aspen Forest. Central Utah mountains at approx 8,000 ft.
I've looked around and the closest guess I could find is Smeared Dagger Moth but I don't think that's right.