Adults large, brightly colored/patterned.
Larvae (found in bracket fungi) are highly sclerotized
Eastern United States and Canada
Larvae feed on bracket fungi. Adults overwinter under bark, often in groups.
Megalodacne fasciata is easily confused with Megalodacne heros. M. heros is larger, and lacks the rows of fine punctures on the elytra that are characteristic of M. fasciata.
Side by side comparison (M. fasciata on left, M. heros on right):
Note also different form of scutellar macula, and pronotal sides near hind angles (slightly concave in heros / straight to slightly convex in fasciata).