Scaphiopodidae — Spadefoot Toads
Species I've seen:
Scaphiopus — North American Spadefoots
Scaphiopus couchii
Couch’s Spadefoot
Scaphiopus holbrookii
Eastern Spadefoot
Spea — Western Spadefoots
Spea bombifrons
Plains Spadefoot
Spea intermontana
Great Basin Spadefoot
Spea multiplicata
Mexican Spadefoot