The taxonomic status ofPyrrhaltaJoannis, 1865 and allied generaTricholochmaeaLaboissière, 1932 andXanthogalerucaLaboissière, 1934 is discussed based on the study of Taiwanese species. Tentatively,XanthogalerucaandPyrrhaltaare regarded as valid genera whileTricholochmaeais a synonym ofPyrrhalta. Fourteen species are recognized and redescribed, includingP. gressittiKimoto, 1969;P. taiwanaKimoto, 1969;P. viridipennisKimoto, 1981;P. igaiKimoto, 1981;P. meifenaKimoto, 1976;P. maculataGressitt & Kimoto, 1963;P. tsouiBezděk & Lee, 2019;P. semifulva(Jacoby, 1885);P. discalisGressitt & Kimoto, 1963;P. ishiharaiKimoto, 1994;P. shirozuiKimoto, 1969;P. kobayashiiKimoto, 1974;P. ohbayashiiKimoto, 1984; andP. takizawaiKimoto, 1996. Taiwanese populations identified asXanthogaleruca aenescens(Fairmaire) were misidentified and those are described as a new species,X. yuaesp. nov.Xanthogaleruca aenescensis redescribed for comparison. Eight additional new species ofPyrrhaltaare described:P. alishanensissp. nov.,P. houjayisp. nov.,P. formosanensissp. nov.,P. jungchanisp. nov.,P. luisp. nov.,P. meihuaisp. nov.,P. tahsiangisp. nov., andP. wulaiensissp. nov.Type specimens ofGalerucella lineatipesTakei, 1916 were rediscovered and are designated as lectotype and paralectotype.Galerucella lineatipesis removed from synonymy withG. calmariensis(Linnaeus, 1767) and regarded as a senior synonym ofP. humeralis(Chen, 1942),syn. nov.MostPyrrhaltaspecies can be classified into four species groups based on their morphological and genitalic similarity. host plants and other biological information are provided for almost all species.