THE BATRACllIA OF NORTH AMERICA. 311 



Crmice. — Among these animals I have examined species of Heliopo* 

 I'us, Platyplectrum, Crinia, Borboroeaetcs, Eusophus, and Hyperolia, 

 and in none can I find m3ie than lateral traces of the epicoracoid and 

 coracoid septa, except in the Hyperolia maronorata, where they are com- 

 plete. The posterior abdominal is well developed in Eusophus nebU" 

 losus. 



Pleurodemce. — Ventrolateral low down, and posterior abdominal well 

 developed in Pleurodema bihronii. 



Ilylodes.—DoTSolsbterdl and ventrolateral far apart; the transverse 

 posterior abdominal septum in the species of Lithodytes, in Ephirexis 

 longipes, in Enhydrohius vomerinus (Elosia Girard) and Hypodictyoii ri- 

 dens. I hp ve not found it in Lithodytes conspicillatus Gthr., Enhydrohius 

 parvus^ and Limnocharis fuscus Bell {Elosia nasus Girard). 



Vystignathi. — In all the species the structure is similar to that of 

 Eaua, except in the approximation of the dorsolateral lines, and the 

 presence of the postabdominal septum, which is continuous with the 

 laterovcntrals, and is indicated externally in several of the species by 

 a fold in its line of attachment. 



The accompanying table exhibits the affinities of the genera and the 

 groups into which they naturally fall. 



This family was first characterized by the author in Proceedings Acad- 

 emy Natural Sciences, 1863, 46; excluding, however, the genera Cera- 

 tophrys and Tomopterna; and subsequently more exactly in the ISTat- 

 ural History Review, 18G5. Several changes, approximations to nature, 

 were proposed by me in 1866. Boulenger adopted this family as I de- 

 defined it (Oat. Brit. Mus., 1882), but modified the extent and definitions 

 of the genera materially. 



Group I. PsEUDES. — Frontoparietal boues fully developed; toes webbed, exterual 

 metatarsi free; terminal phalanges acute; sternum a cartilaginous plate; ear 

 perfectly developed; tongue broad, entire, adherent. 



Cephalic derm distinct ; vomerine teeth ; uo cuneiform shovel or 

 lumbar gland ; prefrontals closely united; pupil horizontal ; no 

 digital dilatations Pseudis Vvagler. 



Cephalic derm distinct; vomerine teeth; no cuneiform shovel or 

 lumbar gland ; prefrontals widely separated from each other and 

 frontoparietals ; ends of digits dilated Lysapsns Cope. 



Cephalic derm distinct ; vomerine teeth ; fingei's and toes webbed ; 

 terminal phalanges bifurcate; supporting disks.. Ce«^ro?e«e Esp. 



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

 lumbar gland; prefrontals not closely united; pupil vertical 

 Mixoplnjes GMir. 



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

 lumbar gland; prefrontals well united, transverse. 

 Cyclorhamphiis Tsch. 



Cephalic derm involved in a rugose cranial ossification, temporal 

 fossa overarched, completing postorbital arch ; vomerine teeth ; 

 no cuneiform shovel or lumbar gland ; prefrontals extensively 

 linitedaud prolonged posteriorly Calyptocephalus D. & B. 



