GENERA OF THE ARCIFEROUS ANURA. 93 



This family was first characterized by the author in Proc. Acad. Nat. Sci. 1863, 46 ; 

 excluding, however, the genera Ceratophrys and Tomopterna; and subsequently 

 more exactly in the Nat. Hist. Review 1865. Several changes, approximations to 

 nature, are now proposed, and the genera for the first time defined. These were 

 distributed' in the last systematic arrangement (1858) in six different families. 



Group I. PsEUDES.— Frontoparietal bones fully developed. Toes webbed, external 

 metatarsi free ; terminal phalanges acute. Xiphisternura a cartilaginous plate. 

 Ear perfectly developed. Tongue broad, entire, adherent. 



Cephalic derm distinct : vomerine teeth : no cuneiform shovel or 



lumbar gland. Prefrontals closely united ; pupil horizontal, . Pseudis. 



Cephalic derm distinct : vomerine teeth ; no cuneiform shovel or 

 lumbar gland : prefrontals widely separated from each other 

 and frontoparietals, Ltsapsus. 



Cephalic derm di.stinct ; vomerine teeth ; a cuneiform shovel ; no 



lumbar gland ; prefrontals not closely united ; pupil vertical, . Mixophtes. 



Cephalic derm distinct ; vomerine teeth ; no cuneiform shovel ; a 

 lumbar gland; eyes anterior; prefrontals well united, trans- 

 verse, PiTHECOPSIS. 



Cephalic derm involved in a rugose cranial ossification, temporal 

 fossa overarched, completing postorbital arch ; vomerine teeth ; 

 no cuneiform shovel or lumbar gland; eyes anterior; prefront- 

 als extensively united and prolonged posteriorly, . . . Caltptocephaltjs. 



Group IT. Ceratophrydes. — Frontoparietal bones fully developed. Toes free or 

 slightly webbed ; the external metatarsi bound ; terminal phalanges simple. 

 Xiphisternum a cartilaginous plate (so far known, emarginate). Ear perfectly 

 developed. Tongue entire, little free. 



a. A cuneiform shovel ; cephalic derm distinct ; no postorbital 

 arch. 

 Eyelids not prolonged ; prefrontals well separated ; vomerine teeth ; 



toes slightly webbed ; inner finger opposable ; form more elongate, Chiroleptes. 

 Prefrontals more or less united ; eyelids not prolonged ; vomerine 

 teeth; toes slightly webbed; cranium elevated; form toad-like; 

 inner finger not opposable ; abdominal derm areolate, . . Tomopterna. 

 aa. A cuneiform shovel ; cephalic derm involved in cranial ossi- 

 fication. A postorbital bony arch. 

 Prefrontals wholly or in part separated ; eyelids with a dermal pro- 

 longation ; vomerine teeth ; toes more or less palmate ; cranium 

 elevated ; form toad-like ; inner finger not opposable ; pupil trans- 

 verse, Ceratophrys. 



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