Pleasing Fungus Beetle

Blue beetle
I found this in Flagstaff, AZ, while I was on a hike. It was on an Aspen tree. I’ve never seen a beetle like this before. Can you tell me what it is?

Hi Molly,
When we first received your letter, we couldn’t immediately identify your Pleasing Fungus Beetle, but we remembered the photo. Today, while researching larvae of the Pleasing Fungus Beetles, family Erotylidae, we stumbled upon photos of the adult Gibbifer californicus on BugGuide, and it matches your submission. So, after three weeks, we have an answer for you and we apologize for the delay.

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