Tachymenis

Tachymenis is a genus of venomous snakes belonging to the family Colubridae. Species in the genus Tachymenis are commonly known as slender snakes or short-tailed snakes and are primarily found in southern South America. Tachymenis are rear-fanged (opisthoglyphous) and are capable of producing a medically significant bite, with at least one species, T. peruviana, responsible for human fatalities.

Species
The following species are recognized by the Reptile Database.
 * Tachymenis ocellata Dumeril, Bibron, & Dumeril, 1854 - ocellated pampas snake
 * Tachymenis peruviana Wiegmann, 1835 - Peru slender snake
 * Tachymenis trigonatus (Leybold, 1873) - false tomodon snake