25-90 inches. Brown or tan above with dark brown, pale-edged, diamond-shaped markings; dark band bordered by light stripes extends diagonally through eyes; tail with pale and dark rings; scales keeled and in 29 rows.
Diamondbacks occur in open pinelands. Adults feed on small rabbits and large rodents. They give birth to from 7-21 young.
Upland portions of Tangipahoa, Washington and St. Tammany Parishes. There are no more than eight verifiable records of the Diamondback in Louisiana, the last one being taken in 1995 near Franklinton.