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Range DescriptionThis species is distributed in southern Lao PDR and north-central Viet Nam east of the Mekong River, and is found between 17°N and about 19.3°N (Geissmann et al. 2000). There is an apparent overlap or interdigitation between the ranges ofN. sikiand N. leucogenys between about 19 and 20°N. Traditionally, the range of N. siki includes central Viet Nam as far south as Bach Ma, but it here extends less to the south to exclude animals that, at least phenotypically (coloration), are N. gabriellae, such that the range extends only as far south as Savannakhet in southern Lao PDR and Quang Binh province, and possibly Quang Tri province in central Viet Nam (Geissmann et al. 2000).