Brotherhead snake is a small and medium-sized venomous snake, with a stubby body, with a body color ranging from yellow-brown to dark brown, with a row of irregular black diamond-shaped spots on the midline of its back. The belly is grayish-white with dark brown spots on it.

The iron head has 19 or 21 scales on the body of the snake, except for the outermost row with obvious ridges, and the head is relatively blunt , slightly triangular in shape, with a dark stripe from the back of the eyes, through the corner of the mouth to the side of the neck, with a pair of cheek sockets, located between the nostrils and the eyes, this is a famous sensory organ of the Rattlesnake subfamily, which can sense changes in heat sources in the environment, The front end of the upper jaw has a pair of retractable teeth, which are shorter in proportion than the tortoise shell flower.