New records of four species (Lema lacertosa Lacordaire, 1845, L. diversipes Pic, 1921, L. cyanella (Linnaeus, 1758), L. trivittata trivittata Say, 1824 and additional information on one recently recorded species (L. solani Fabricius, 1798) are reported for Taiwan. Lema diversipes Pic, 1921 is removed from synonymy with L. lacertosa Lacordaire, 1845; both species are redescribed. A lectotype is designated for L. phungi Pic, 1924. The synonymies of L. phungi Pic, 1924 and L. jeanvoinei Pic, 1932 with L. lacertosa Lacordaire, 1845 are supported. A revised key to the known species in Taiwan is provided.