Adult beetles are 5 mm long and 3 mm wide (approx. one third the size of a worker bee). After the beetle emerges from the soil, it might be coloured reddish brown, but it darkens rapidly to brown or black. The body is divided into three parts: head, thorax and abdomen. Characteristic features of adult beetles are the “club-shaped” antennae and the short elytra, which are smaller than the abdomen, so the end of the abdomen is expose.