Dorsally, it is grayish with oblique black crossbars, and has a series of whitish spots along the vertebral line. On the head, it has a pair of black streaks from the prefrontals to the occiput, another black streak from the eye to the commissure of the jaws, and another along the nape. The upper labials are black-edged. Ventrally, it is spotted or checkered with dark brown or black. Adults are about 875mm in total length.