SeasonalityAdults fly form early June to mid-August.
IdentificationAdult antennae are brown with darker scapes. Vertex of the head is deep red-brown, flat and evenly covered with large bumps. Spurs are yellow. Forewings are grey-brown to almost black, in a mixture of solid blocks of colours. In males, the forewing disto-posterior edge is sinuate. The clasper is massive with a full base. The dorsal edge with single teeth at each end (Nimmo, 1971).