A new species of Ninia (Serpentes, Colubridae) from western Ecuador and revalidation of N. schmidti.

We describe a new species of Ninia Baird & Girard, 1853 endemic to the cloud forests of northwestern Ecuador. The new species has previously been confused with N. atrata (Hallowell, 1845) and N. teresitae (Angarita-Sierra and Lynch 2017) but is genetically most closely related to a third species of Ninia endemic to the Chocoan--Tumbesian transition area of western Ecuador. We revalidate the name N. schmidti (Jan, 1862), designate a neotype, and provide a diagnosis of the taxon and a description of its hemipenial morphology based on new material. The new and revalidated species can easily be identified from one another and from other trans-Andean South American Ninia based on ventral and subcaudal scale counts, hemipenial morphology, and coloration of the supralabials, throat, and belly. Finally, we remove N. atrata from the herpetofaunal list of Ecuador. [ABSTRACT FROM AUTHOR]