The Trans-Pecos rat snake (Bogertophis subocularis) is a medium to large (1.0 - 1.7 m), nonvenomous rat snake native to the Chihuahuan Desert, that extends northward into Texas. It has a row of small scales (suboculars) between the lower border of the eye and the upper labials. This is a beautiful snake, yellow to tan dorsally with a series of black or dark brown H-shaped markings. The eyes are large and prominent, light-colored with contrasting round black pupils.