A taxonomic revision of the Asian keelback snakes, genus Amphiesma (Serpentes: Colubridae: Natricinae), with description of a new species Author Guo, Peng College of Life Sciences and Food Engineering, Yibin University, Yibin 644007, China & Biology Institute, Yibin University, Yibin 644007, China Author Zhu, Fei College of Life Sciences and Food Engineering, Yibin University, Yibin 644007, China & College of Life Sciences, Sichuan University, Chengdu 610064, China Author Liu, Qin College of Life Sciences and Food Engineering, Yibin University, Yibin 644007, China & Biology Institute, Yibin University, Yibin 644007, China Author Zhang, Liang South China Institute of Endangered Animals, Guangzhou 510260, China Author Li, Jian X. College of Life Sciences and Food Engineering, Yibin University, Yibin 644007, China Author Huang, Yu Y. College of Life Sciences and Food Engineering, Yibin University, Yibin 644007, China Author Pyron, R. Alexander Department of Biological Sciences, 2023 G St. NW, The George Washington University, Washington, D. C. 20052 USA Corresponding author. E-mail: ybguop @ 163. com text Zootaxa 2014 2014-10-17 3873 4 425 440 journal article 5293 10.11646/zootaxa.3873.4.5 49fea170-00d0-41ad-bedf-7bfb215d7768 1175-5326 4948201 3B3F6C1E-BBD9-4ED3-91CC-4B89FBC9E348 Amphiesma Duméril, Bibron, and Duméril, 1854 Type species: Coluber stolatus Linnaeus, 1758 Content. A. stolatus Diagnosis. Solid-toothed non-venomous snakes with keeled scales on the body in 19 dorsal rows mid-body, anal usually divided, and all subcaudals divided. Everted hemipenis is Y shape with simple sulcus. Notes. This is a restricted definition of this genus. Gender is neuter. This group may contain additional species here referred to Hebius , and likely presents a continuing problem with respect to Xenochrophis . Further taxonomic revision will likely be necessary in the future.