Yaqui Black-headed Snake vs. Chihuahuan Black-headed Snake

Both live under rocks in the Santa Rita and nearby southeastern mountains. A: The cap runs 2 to 4 small scales PAST the head plates before the white collar in the Yaqui Black-headed Snake; the wide pale collar crosses the TIPS of the head plates in the Chihuahuan Black-headed Snake. B: The dark cap wraps down the side of the neck behind the corner of the mouth in the Yaqui Black-headed Snake; the dark colour stops at the corner of the mouth in the Chihuahuan Black-headed Snake.

Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.

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