A thick-bodied pit viper with a
relatively long tail. Its head is triangular and has a thin white line running from the tip of its snout along its upper jaw and another through its eyes. Its body is black or dark brown with wide bands of slightly paler brown edged with white.
Size To about 1 m.
Distribution W coast of Mexico.
Habitat Dry forests and scrub.
Food Rodents, and probably lizards.
Bre e ding Live-bearing, with litters of up to 10 young.
Note s The thin white lines on its head make this one of the most distinctive pit vipers. DANGEROUSLY VENOMOUS