Morphological comparison of the holotype specimen of Oligodon hamptoni (NHMUK 1946.1.1.71) with the newly recorded specimen from Baoshan, Yunnan Province, China. (A) Lateral and (B) dorsal aspects of the holotype specimen of Oligodon hamptoni (NHMUK 1946.1.1.71) from the original description (Boulenger, 1918); (C) dorsolateral aspect of the holotype specimen of Oligodon hamptoni (NHMUK 1946.1.1.71), photograph by Justin L. Lee; and (D) dorsolateral aspect of the Tengchong specimen (not collected), photograph by Zhuan-Yun Hu.