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 ITIS and Reptile Database. Other sources may recognize as many as 16 distinct species: