The species is endemic to northwestern South America.

[2] The preferred habitats of S. bicolor are lowland rainforest and Andean cloud forest; in both it is found in leaf litter and in bushes.

[2] S. bicolor is nocturnal, terrestrial, and semiarboreal.

[2] Dorsally, S. bicolor is uniformly brown, lighter on the sides.

The dorsal scales are keeled, in 19 rows at midbody, and without apical pits.