It means powder-like (relative to color). It is a genus of nocturnal snakes, living among the leaf litter. They are found throughout almost all of America. They belong to the family Dipsadidae.
Coniophanes : Genus of snakes of the family of dipsadinos that are distributed in North America, Central America and North South America, being nocturnal habits and feeding on frogs, lizards, small rodents and small snakes.