Rhagodera costaefragmenta Krinsky, new species, from San Clemente Island, California is described. It is only the second insular species of Rhagodera Dejean known. It resembles Rhagodera tuberculata Mannerheim but is distinguished from that species by its interrupted elytral costae. A revised key to the species of Rhagodera found north of Mexico is provided.
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Vol. 69 • No. 2