diversity Article Revision of the Subgenus Burlinius Lopatin (Coleoptera, Chrysomelidae, Cryptocephalinae) from China and Description of Four New Species † Wenyuan Duan 1,2 and Hongzhang Zhou 1,2, *   Citation: Duan, W.; Zhou, H. Revision of the Subgenus Burlinius Lopatin (Coleoptera, Chrysomelidae, Cryptocephalinae) from China and Description of Four New Species. Diversity 2021, 13, 523. https:// doi.org/10.3390/d13110523 Academic Editors: Ming Bai, Joshua Max Jenkins Shaw and Michael Wink Received: 24 September 2021 Accepted: 18 October 2021 Published: 23 October 2021 Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affil- iations. Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). 1 Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Rd., Chaoyang District, Beijing 100101, China; duanwenyuan@ioz.ac.cn 2 University of the Chinese Academy of Sciences, 19A Yuquan Rd., Shijingshan District, Beijing 100049, China * Correspondence: zhouhz@ioz.ac.cn; Tel.: +86-10-64807252 † http://zoobank.org/urn:lsid:zoobank.org:pub:D7A52453-1D1B-49EC-BFE9-3B38B78B4A7A. Abstract: This study revised the subgenus Burlinius Lopatin, 1965, of the genus Cryptocephalus Geoffroy, 1762 (Coleoptera, Chrysomelidae, Cryptocephalinae, Cryptocephalini), and describes four new species, namely, Cryptocephalus (Burlinius) longchiensis sp. nov., C. (Burlinius) baowenzhengi sp. nov., C. (Burlinius) tomurensis sp. nov., and C. (Burlinius) glabrelegantulus sp. nov. The species C. (Burlinius) turpis Chen, 1942, and C. (Burlinius) yangweii Chen, 1942, were revalidated and treated as distinct species. Another four species were transferred into this subgenus from the subgenus Cryptocephalus, namely, C. (Burlinius) flavolimbatus Pic, 1920 (stat. nov.), C. (Burlinius) pusus Schöller, 2009 (stat. nov.), C. (Burlinius) scutemaculatus Tan, 1992 (stat. nov.), and C. (Burlinius) shaowuanus Gressitt & Kimoto, 1961 (stat. nov.). Two species (including one more subspecies) were removed out of this subgenus, namely, C. (Burlinius) nigrolimbatus Jacoby, 1890, C. (Burlinius) pallidipes Pic, 1927, and C. (Burlinius) pallidipes nakatae Gressitt & Kimoto, 1961; they were transferred into the subgenus Cryptocephalus. Thus, the subgenus Burlinius Lopatin includes now a total of 26 species in China according to our revision. A key to all the Chinese species of this subgenus is provided as well as color illustrations and line drawings for the general habitus and genital structures. Keywords: Cryptocephalus; key to Chinese species; leaf beetles; new species; taxonomic revision 1. Introduction The subgenus Burlinius Lopatin, 1965 [1], is a special leaf beetle group within the megadiverse genus Cryptocephalus Geoffroy, 1762 [2] (Coleoptera, Chrysomelidae, Crypto- cephalinae, Cryptocephalini). It was created by Lopatin (1965), based on the type species of Chrysomela fulva Goeze, 1777 [3], which included 52 species at the time of its creation, which were originally included in the genus Cryptocephalus Geoffroy but had not yet been assigned to any subgenus. Before the present study, the subgenus Burlinius Lopatin in- cluded 128 species, which were distributed mainly in the Palearctic region [1,4,5] (Lopatin, 1965; Warchalowski, 2010; Lopatin et al., 2010). The species number of Burlinius Lopatin was growing along with taxonomic knowledge of the megadiverse genus Cryptocephalus. In addition to 52 species included originally in Burlinius, Warchalowski (2010) [5] increased the number to 94 species and subdivided them into four different species groups in his book, titled “The Palearctic Chrysomelidae: identification keys”. In the book series “Cat- alogue of Palearctic Coleoptera” (edited by Löbl and Smetana), Lopatin et al. (2010) [4] catalogued a number of 121 species and another 10 subspecies in this subgenus. Regarding the Chinese fauna, Chen (1942) [6] studied the Chinese Cryptocephalus and Gressitt, and Kimoto (1961) [7] revised the entire leaf beetles’ fauna of China and Korea; there were 13 Burlinius species reported to occur in China, but they were not assigned to any subgenus then. Before our study, a total of 19 species of Burlinius were found to occur in China Diversity 2021, 13, 523. https://doi.org/10.3390/d13110523 https://www.mdpi.com/journal/diversity