Behaviour

Adult males are black and glossy and their elytra are very finely pitted. 

Their most dramatic feature is a large “horn” arising from the pronotum, the underside of which is thickly covered in thick yellow-gold hairs.  Another horn arises from the head, and males use these horns in combat over females. 

In contrast females do not have a thoracic horn and are much less shiny.