Within this grouping is the genus Opheodrys — the green snakes. Length: 22 inches to 32 inches Diet: Caterpillars, grasshoppers, crickets, dragonflies, other insects and spiders form the bulk of ...

Scientific Names: Opheodrys aestivus, Opheodrys vernalis. Adult Size: Rough green snakes are roughly 2 to 3 feet long; smooth green snakes are smaller and shorter, at about 2 feet.