An ominously impressive snake to meet in the field; suddenly finding yourself in close proximity to the compact coils, broad head, and loud buzzing rattle is almost certain to raise the hair on the nape of the neck. The diamonds, dark brown or black in color, are strongly outlined by a row of cream colored or yellowish scales. Ground color olive, brown, or almost black. Pattern and colors vivid in freshly shed specimens; dull and quite dark in those preparing to shed. Only Rattler within its range with 2 prominent light lines on face. Scales keeled ; anal single