Two new species of the genus Andixius Emeljanov & Hayashi, A. cultratus Wang, Zhi & Chen, sp. nov. and A. lingulatus Wang, Zhi & Chen, sp. nov. are described and illustrated from China to provide the genus with six species in total. A key to species of Andixius is presented.

Five new species of the genus Andes Stål, 1866, A. balteiformis Wang, Zhi & Chen sp. nov., A. bifidus Wang, Zhi & Chen sp. nov., A. furcutus Wang, Zhang & Chen sp. nov., A. latanalus Wang & Chen sp. nov. and A. pallidus Wang & Chen sp. nov. from China, are described and illustrated. A key to the species of Andes in China is provided.

Although many hypotheses have been proposed to understand the mechanisms underlying large-scale richness patterns, the environmental determinants are still poorly understood, particularly in insects. Here, we tested the relative contributions of seven hypotheses previously proposed to explain planthopper richness patterns in China. The richness patterns were visualized at a 1° × 1° grid size, using 14,722 distribution records for 1335 planthoppers. We used ordinary least squares and spatial error simultaneous autoregressive models to examine the relationships between richness and single environmental variables and employed model averaging to assess the environmental variable relative roles. Species richness was unevenly distributed, with high species numbers occurring in the central and southern mountainous areas. The mean annual temperature change since the Last Glacial Maximum was the most important factor for richness patterns, followed by mean annual temperature and net primary productivity. Therefore, historical climate stability, ambient energy, and productivity hypotheses were supported strongly, but orogenic processes and geological isolation may also play a vital role.

The Chinese cixiid planthopper tribe Eucarpiini is studied taxonomically. Four genera and 29 species belonging to Eucarpiini are reported from China, including 15 new species of three genera: Dilacreon (Dilacreon) deltodontus sp. nov., Dilacreon (Eluzalmon) apiculatus sp. nov., D. (E.) arcuatus sp. nov., D. (E.) biprocessus sp. nov., D. (E.) congjiangensis sp. nov., D. (E.) distentus sp. nov., D. (E.) erectus sp. nov., D. (E.) falcatus sp. nov., D. (E.) parapentagonus sp. nov., D. (E.) transversus sp. nov., Kirbyana projecta sp. nov., K. spinata sp. nov., Neocarpia brevispina sp. nov., N. longispina sp. nov. and N. trispina sp. nov.. All species dealt with are described and illustrated and keys for genera and their species are also given.

The genus Parandes Muir, 1925 (Cixiinae, Andini) is recorded from China for the first time with two new species, Parandes circinatus Wang & Chen sp. nov. and Parandes fuscus Wang & Chen sp. nov. Color images for the adults of the two new species and line drawings for the genitalia are provided. A key is presented to separate all species within the genus.

Four new species of the genus Andixius Emeljanov & Hayashi, 2007 are described and illustrated from China. These are A. flagellihamus Wang & Chen, sp. nov., A. gracilispinus Wang & Chen, sp. nov., A. productus Wang & Chen, sp. nov. and A. truncatus Wang & Chen, sp. nov. Photographs of the new species and an identification key to all Andixius species are provided.