The grey-banded kingsnake, (Lampropeltis alterna), or more commonly just referred to as the alterna, is a species of non-venomous colubrid snake, found in the Trans-Pecos/Chihuahuan Desert region of western Texas, southern New Mexico, and northern Chihuahua. Some sources list two distinct subspecies of alterna, as L. a. alterna and L. a. blairi (Flury, 1950) differentiated by patterning and locale, but research has shown them to be the same.