Abstract
The species of Polyphylla Harris, 1841 of the subgenus Granida Motschulsky, 1862 recorded from Vietnam are redescribed, their known distribution is extended and affinities are rediscussed based on the evidence provided by correct attribution of aedeagi and new morphological characters. Polyphylla (Granida) vietnamica Kobayashi & Fujioka, 2016 is considered to be closely related to P. (G.) nikodymi de Wailly, 1993, known from south-east Myanmar, and its holotype is recognized to be an aberrant specimen. Polyphylla (G.) kontumensis Kobayashi & Fujioka, 2016 is considered closely related to P. (G.) simoni Sehnal & Bezdĕk, 2011 and treated as its subspecies; the latter is rediagnosed and the diagnostic value of elytral pattern in Granida is discussed.