What is "scaphiopus holbrookii"

Spadefoot \Spade"foot`\ (sp[=a]d"f[oo^]t`), n. (Zo["o]l.) Any species of burrowing toads of the genus Scaphiopus, esp. Scaphiopus Holbrookii, of the Eastern United States; -- called also spade toad.

Scaphiopus holbrookii, commonly known as the eastern spadefoot, is a species of American spadefoot toad (family Scaphiopodidae) endemic to the United States.