Dorsal ground color is light brown to yellow. The dorsal pattern consists of dark brown or black lines in a net-like formation, perhaps suggestive of diamonds. Dark vertical bars may be evident along the sides of the snake.
Ventral surface is yellow with dark spots or half moons.
In North America, Nerodia rhombifer is in the Mississippi River Valley from Indiana and from Iowa south to the Gulf of Mexico. In Texas, it is found in the eastern two-thirds of the state. This project funded by the University of Texas College of Natural Sciences and the Texas Memorial Museum . Comments welcome .