Triarius is a genus of skeletonizing leaf beetles in the family Chrysomelidae. There are about seven described species in Triarius. They are found in North America and Mexico.
Species These seven species belong to the genus Triarius: Triarius lividus (J. L. LeConte, 1884) Triarius melanolomatus (Blake, 1942) Triarius nigroflavus E. Riley, S. Clark & Gilbert, 2001 Triarius pini Triarius texanus Clark & Anderson, 2019 Triarius trivittatus Horn, 1893 Triarius vittipennis (Horn, 1893)
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