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Checkered Garter Snake vs. Lined Snake

Out of state their ranges overlap in Texas, Oklahoma and Kansas (39 one-degree squares). A: A pale crescent and black blotch behind the corner of the mouth in the Checkered Garter Snake; no crescent; a small, narrow head in the Lined Snake. B: A bold black checkerboard in the Checkered Garter Snake; grey-brown with small dark flecks in the Lined Snake. C: Pale, unmarked or smudged (no open photo shows it) in the Checkered Garter Snake; a double row of black half-moons down the middle (no open photo shows it) in the Lined Snake. The Lined Snake is also much smaller (to 15 in).

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Checkered Garter Snake

Thamnophis marcianus

Lined Snake

Tropidoclonion lineatum
Checkered Garter Snake vs. Lined Snake: comparison sheet with the differences marked

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

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