Keitheatus is a genus of skeletonizing leaf beetles in the family Chrysomelidae. There is one described species in Keitheatus, Keitheatus blakeae. They are found in Texas and Mexico.

A second species, Keitheatus histrio from Baja California in Mexico, was originally included in the genus, but was transferred to Pseudoluperus in 2005 and Amplioluperus in 2022.

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