First report of leucism for the kraits Bungarus walli Wall, 1907 and B. niger Wall, 1908

Six species of kraits, genus Bungarus, have been recorded in Nepal (e.g., Schleich and Kästle, 2002; Sharma et al., 2013), including B. bungaroides (Cantor, 1839), B. caeruleus (Schneider, 1801), B. fasciatus (Schneider, 1801), B. lividus Cantor, 1839, B. niger Wall, 1908, and B. walli Wall, 1907. These species occur from the lowland habitats of the Terai Plains along the Nepal-India border into habitats at intermediate elevations in the Siwalik Hills and into the Mahabharat Range (Joshi et al., 2019), extending in the case of B. caeruleus, the most commonly encountered krait in Nepal, up to elevations of at least 1525 m, and up to 1730 m in B. bungaroides (Schleich and Kästle, 2002; Sharma et al., 2013). All of these species appear to be of medical importance as a cause of snakebite mortality and morbidity (e.g., Bhetwal et al., 1998; Pandey, 2015).