Common Checkered Whiptail vs. Six-lined Racerunner

Both live in southeastern Colorado and across the southern plains (records share 19 one-degree squares). A: Pale stripes cut and joined by black bars and squares: a checkerboard in the Common Checkered Whiptail; six or seven clean pale stripes; the dark fields between them plain in the Six-lined Racerunner. B: No green or blue in the Common Checkered Whiptail; a green wash on the head and forebody; males blue on the throat and belly in the Six-lined Racerunner. The Common Checkered Whiptail is bigger (to 4.2 in head and body vs about 3 in) and all are females.

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