CONCLUSIONS
Based on more extensive sampling, we conducted a comprehensive study of Chinese species of Sibynophis , providing new insights into their systematics and distribution. Our results revealed that S. c. miyiensis is synonymous with S. c. graham i, which should be elevated to a species level. Furthermore, S. triangularis is reported as new to China and Myanmar. In total, four species, S. chinensis , S. collaris , S. grahami , and S. triangularis , are distributed in China. Consequently, we revised their distribution boundaries in China and re-examined previously misidentified specimens.