Mastigodryas

Mastigodryas is a genus of colubrid snakes. Like some other colubrids, they are commonly called racers. It is a Neotropical genus, with members distributed from Mexico to Argentina and several islands in the Caribbean. Some authorities use the older generic name, Dryadophis, for these species.

==Description== These snakes are cylindrical or somewhat laterally compressed in shape. The head is distinct from the rest of the body, as in many other colubrids. They have large eyes. They have Duvernoy's glands. The morphology of the hemipenis in various species has been helpful in elucidating their relationships, as little is known about the evolutionary origins of the genus.