You guys have a great site! I found a dead tree while hiking near Colorado Springs today that had 50-100 of these beetles on it. Many of them were copulating (sorry I didn’t get pics for your insect sex page). I’ve seen them before and wondered what they were. After looking through 6 pages of beetle pics I finally found it. Thanks so much! Further research seems to say that the scientific name has changed to Gibbifer californicus, but it is definitely the right beetle. I’m attaching a picture even though the one you have is probably better.
Thank you for taking the time to forward your photo of a Pleasing Fungus Beetle. We think is is quite good.