Abstract
The Dipsadini, a tribe of dipsadine colubrids, comprises the genus Dipsas, Plesiodipsas, Sibon, Sibynomorphus and Tropidodipsas, with 66 valid species of neotropical snakes, distributed from Mexico to northern Argentina. These genera show an extensive variation on color patterns and pholidosis, characters upon which relies the group systematic. Although several taxonomic works has been pu…