Chironius scurrulus, commonly known as the smooth machete savane, is a large slender colubrid snake. It is also known as Wagler's sipo.
It is found in tropical rainforests of the Brazilian Amazon, Southeastern Colombia, northern Bolivia, Ecuador, east of Venezuela, Peru, Trinidad and Tobago, Guyana, Suriname, French Guiana.
The dorsal scales are in only 10 rows.
It feeds on frogs and lizards. They are diurnal. They live in primary and secondary forest habitats, on the ground or small trees, or in shrubs and bushes.