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Ricchiardi, E. and Li, S. 2017. Revision of Chinese mainland Hybovalgus Kolbe, 1904, with description of a new species, and Excisivalgus Endrödi, 1952 reduced to synonymy with Hybovalgus (Coleoptera: Scarabaeidae). European Journal of Taxonomy. 340 (Aug. 2017). DOI:https://doi.org/10.5852/ejt.2017.340.