Limbourg 2004. [Description of two new Afrotropical species of Popillia Serville, 1825 and two new species of Nannopopillia Kolbe, 1894 (Coleoptera, Scarabaeoidea, Rutelidae).] Bulletin de la Societe Royale Belge d'Entomologie, 140(1-6), Januari-Juni 2004: 49-53