Xanthonia vagans is a species of leaf beetle. Its range spans from Central Texas and Arizona (USA) to Sonora, Mexico. It is associated with junipers.

A relatively large Xanthonia, X. pilosa measure 3.8–5.2 mm (0.15–0.20 in) in length. The dorsal ground color is medium to dark brownish. The elytra have vague dark streaks.

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