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© 2020 Coleopterists Society.All right reserved. Species of Dichelonyx Harris with a sulcate pronotum and from southern California, USA and Baja California, Mexico are treated in this paper. Dichelonyx magnesae McPeak and Lago, new species, and Dichelonyx bajaensis McPeak and Lago, new species, are described. The new species are illustrated, diagnostic characters to separate them from previously described species are discussed, and a key to "sulcate" Dichelonyx species from southern California and Baja California is presented.

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