Adults are 20-25 mm long, 7-10 mm wide, stout, brown with a clear St Andrew’s cross in yellow on its back, legs long, shoulders of pronotum project into short spines in adults and mature nymphs. Hind legs much thicker than other legs, hind femur with inner rows of fine teeth and one preapical spine. Hind femora shorter and much swollen in male. Hind tibia inwardly lamellate in about middle 1/3, less so in male which also has a distinct spine on lamellate area Male has 1st visible abdominal sternite with more prominent callosities than in female.
Later instar nymphs have a pair of orange spots in the middle of the upper surface of abdomen, wing pads in later instars marked with orange.