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Criocerine leaf beetles found in Nepal feeding on Dioscorea bulbifera (L.), an exotic, invasive weed of Asian origin, were identified as Lilioceris cheni Gressitt and Kimoto based on a synopsis of the Oriental Lilioceris species and review of the Lilioceris impressa species group. All the continental, Oriental species included in the group are diagnosed and illustrated, and a key for their identification is provided. Species status of Lilioceris thibetana Pic, 1916 is resurrected. The following new synonyms are proposed: L. coomani (Pic, 1928) = L. egena (Weise, 1922), and L. subcostata (Pic, 1921a), L. laticornis (Gressit, 1942), L. inflaticornis Gressit and Kimoto, 1961, and L. maai Gressit and Kimoto, 1961 = L. impressa (Fabricius, 1787). Lectotypes of the following species are designated: L. coomani Pic, 1928; L. impressa (Fabricius, 1787); L. laosensis (Pic, 1916); L. malabarica (Jacoby, 1904); L. ruficornis (Pic, 1921b); L. subcostata (Pic, 1921a); L. thibetana (Pic, 1916); and L. unicolor (Hope, 1831).