Among the unidentified frogs from Colombia sent to us by Chi- cago Natural History Museum is a single specimen of a broad- headed leptodactylid that seems to be undescribed.Not only are we unable to allocate it specifically but it does not seem to belong with any of the described genera.The cartilaginous sternum, pointed terminal phalanges, and unwebbed toes seem to align it with that section of the family that contains Eusophus, Zachaenus, and Craspedoglossa, although in general appearance it has the aspect of something allied to Ceratophrys or Lepidobatrachus.Amblyphrynus, new genus Type species.-