 The specific epithet "marcianus" is in honor of American Brigadier General Randolph B. Marcy, who led surveying expeditions to the frontier areas in the mid-19th century.The checkered garter snake is typically greenish in color, with a distinct, black checkerboard pattern down its back.It is capable of growing to a total length (including tail) of 42 inches (107 cm), but is usually 18 to 24 inches (46 to 61 cm).