Adults usually grow no more than 2m, but some have been recorded at 2.5m. There was however, one exception, one M.S. Variegata was recorded at 80cm at four years old.
The color pattern consists of a beige or brown ground color overlaid with blackish or gray blotches, cross-bands or stripes, or a combination of any of these. Regional color variations can include bright yellow, gold, rust and clear grays.