Maxillary teeth 10 to 13, one or two in the middle much enlarged and fang-like, preceded and followed by an interspace, the two posterior grooved. Anterior mandibular teeth long, posterior small. Head elongate and distinct from neck, with angular canthus rostralis. Eye rather large, with round pupil. Body elongate and cylindrical with smooth scales in 15 or 17 rows, with apical pits. Ventrals rounded or obtusely angulate laterally, the tail is long with the subcaudals in two rows.