Redescription of Apostolepis ambiniger (Peters, 1869) (Serpentes: Dipsadidae: Elapomorphini)
Apostolepis is a diverse genus of dipsadid snakes, currently comprising 34 species occurring in most cis-Andean South America. The taxonomy of the group is highly unstable. Upon discovering its type series, we redescribe the rare species A. ambiniger (Peters, 1869) and provide an account of its geographic distribution and morphological variation in pholidosis, osteology, and hemipenial
characters. We also discuss some aspects of the taxonomy of Apostolepis.