Handsome Fungus Beetle

These 3 fungus beetles were found on the underside of an Alder Bracket fungus (inonotus radiatus) They are about 2cm long and 1.5cm wide. They can be easily identified by their circular shape and black body with four orange dots. This is a mutualistic, symbiotic relationship because the beetles help transport the fungus spores to grow on new trees and the fungus protects the beetle and it's larvae.