Range Extention of Two Rare Snake Species, <i>Calamaria concolor</i> Orlov, Nguyen, Nguyen, Ananjeva et Ho, 2010 and <i>Colubroelaps nguyenvansangi</i> Orlov, Kharin, Ananjeva, Nguyen et Nguyen, 2009 (Serpentes: Colubridae) in

Two rare colubrid snake species, Calamaria concolor Orlov, Nguyen, Nguyen, Ananjeva et Ho, 2010 and Colubroelaps nguyenvansangi Orlov, Kharin, Ananjeva, Nguyen et Nguyen, 2009, are currently recognized as endemic to Vietnam. However, information on their distribution, natural history, and conservation status remains scarce. Based on herpetological surveys conducted in central and southern Vietnam during 2017, 2023, and 2024, we report the first confirmed records of C. concolor from Quang Nam Province and C. nguyenvansangi from both Dak Nong Province and Di Linh District, Lam Dong Province. These new locality records represent significant range extensions for both species. Field observations provide preliminary insights into their habitat preferences and microhabitat use. Given the broader distributional range revealed by these findings and the absence of immediate threats at known localities, we propose that both species be assessed as Least Concern (LC) under the IUCN Red List criteria.