Morphology of antenna and mouthparts of adult Adoryphorus couloni (Burmeister) (Coleoptera: Scarabaeidae: Dynastinae)

The head appendages of Adoryphorus couloni, a pasture pest in southeast Australia, are described and inferences are drawn about the beetle's biology. There is a lack of sexual dimorphism in the antennae. The long‐lived adults possess a full range of labial sensilla but the mandibles appear incapable of chewing. Hence trapping based on pheromones or feeding attractants is unlikely.