Light or greyish brown with dark, broad band extending along back, the centre of which runs an irregular series of wavy, yellowish white elongated blotches or streaks. Flanks lightly spotted with black and marked with large dark blotches, sometimes with pale centres. Top of the head dark brown marked with yellowish white line from snout back through the eye. Below whitish with dark brown or black blotches. Length up to 6 m.