On the distribution of Gonyosoma prasinum (Blyth, 1854) and Gonyosoma coeruleum Liu, Hou, Ye Htet Lwin, Wang amp; Rao, 2021, with a note on the status of Gonyosoma gramineum Gnther, 1864 (Squamata: Serpentes: Colubridae).

Based on 85 examined specimens, photographs of living specimens and illustrations published in the literature, we refine the distribution ranges of both Gonyosoma prasinum (Blyth, 1854) and of the recently described species Gonyosoma coeruleum Liu, Hou, Ye Htet Lwin, Wang Rao, 2021, which was not clearly addressed in its original description. We also redescribe the syntypes of Coluber prasinus Blyth, 1854 and the holotype of Gonyosoma gramineum Gnther, 1864, we discuss the status of this latter taxon, and we describe the hemipenial morphology of G. coeruleum.

On the distribution of the species of the genus Hebius Thompson, 1913 (Squamata: Natricidae) in northern Thailand, including the description of a new species and a discussion on snake diversity of this region.

We examined and identified preserved specimens, skins, and photographs from a collection of 83 snakes from northern Thailand presenting the characters of the genus Hebius Thompson, 1913. They belong to at least six different taxa divided into five species including a new one described here, namely H. bitaeniatus (Wall, 1925), H. deschauenseei (Taylor, 1934), H. igneus David, Vogel, Nguyen, Orlov, Pauwels, Teyni Ziegler, 2021, Hebius khasiensis (Boulenger, 1890), and a series of specimens with strong similarities to H. khasiensis that are here preliminary identified as Hebius cf. khasiensis. Furthermore, we obtained a series of 21 different specimens in the most western strip of the region that we could not refer to any presently known species. We refer these specimens to a new species that we describe here. For each of these taxa, we provide the list of localities and specify the geographic range in northern Thailand. Lastly, we also discuss the diversity of the snake fauna of northern Thailand.