Southwestern Blackhead Snake vs. Plains Black-headed Snake
Out of state: their records overlap in west Texas and New Mexico (review/b2-overlap.js). A: Ends straight across or rounded just behind the head in the Southwestern Blackhead Snake; reaches back in a point 2 to 5 scales past the head in the Plains Black-headed Snake. B: Brown in the Southwestern Blackhead Snake; tan to brown in the Plains Black-headed Snake.
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