These large, oval beetles are 1.7 to 3 cm long. Their colour varies from yellowish orange to reddish brown. Their short antennae end in clubs made of plates called lamellae, which unfurl into a fan.
Their elytra (wing covers) have three black dots on the side and a fine black line on the dorsal portion. Southern specimens have light brown legs, while northern ones have darker legs.
The fleshy grubs are whitish and C-shaped, and may be up to 5 cm long.