Mexican Garter Snake vs. Black-necked Garter Snake
Both live at ciénegas, stock tanks and streams of southeastern and central Arizona. A: On scale rows 3 and 4 (counting up from the belly) in the Mexican Garter Snake; on scale rows 2 and 3 in the Black-necked Garter Snake. B: No big black blotches on the neck in the Mexican Garter Snake; two big black, crescent-shaped blotches on the neck in the Black-necked Garter Snake.
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