A taxonomic revision of the Neoserica (sensu lato) calva group (Coleoptera, Scarabaeidae, Sericini)

The species of the Neoserica(sensu lato)calva group are revised. Neosericacalva Frey, 1972, comb. n. is redescribed. Thirteen new species are described from China and South Korea: Neosericaailaoshanica sp. n., Neosericaanonyma sp. n., Neosericacalvoides sp. n., Neosericagulinqingensis sp. n., Neosericakoelkebecki sp. n., Neosericaliangi sp. n., Neosericaluxiensis sp. n., Neosericamenghaiensis sp. n., Neosericamengi sp. n., Neosericataipingensis sp. n., Neosericazheijangensis sp. n., Neosericazhibenshanica sp. n., and Neosericazongyuani sp. n. A key to Sericini genera with multilamellate antenna and species groups of Neoserica of mainland Asia as well as a key to species of the Neosericacalva group are provided. A map of species distribution is given, habitus and male genitalia are illustrated.