338 HTLID^. 



I860, p. 110, and Journ. Ac. Philad. (2) vi. 1863, p. 36, & 1867, 



p. 200. 

 Ceutrotelina, Burmeister, Erldiiter. Faun. Bras. p. 97 ; Ci>|/je, Juurn. 



Ac. Philad. (2) vi. 1867, p. 200. 

 Hyloiuedusa, Bunneister, I. c. p. 102. 



Pelodryas, Giinth. Cat. p. 119; Cope, Nat. Hist. Rev. 1865, p. 109. 

 Scytopis, Cope, Proc. Ac. Philad. 1862, p. 3o4 ; Nat. Hist. Rev. p. 109; 



and Journ. Ac. Philad. (2) vi. 1806, p. 85. 

 Osteoceplialus, {Fitzinc/.) Steindachn. Arch, per la Zool. ii. fasc. i. 



p. 77 ; Cope, Nat. Hist. Rev. 1865, p. 110, and Journ. Ac. Philad. 



(2) vi. 1866, p. 85. 

 Acrodytes, Cope, Nat. Hist. Rev. 1865, p. 109. 

 Smilisca, Cojk, Proc. Ac. Philad. 1865, p. 104. 

 Drvoinelictes, Cope, I. c. 



Cinclidium, Cope, Journ. Ac. Philad. (2) vi. 1867, p. 200. 

 Chirodryas, Keferst. Gottim/. Nachr. 1867, p. 358. 

 Copliomautis, Peters, Mon. Bed. Ac. 1870, p. 651. 

 Cincloscopus, Cope, Proc. Amer. Philos. Soc. 1870, p. 554. 

 Plectrohyla. Brocchi, Bull. Soc. Philotn. (7) i. p. 92. 

 Cauphias, Brocchi, I. c. p. 129. 



Pupil horizontal. Tongue entire or slightly nicked, adherent 

 or more or less free behind. Yomerine teeth. Tympanum distinct 

 or hidden. Fingers free or more or less webbed ; toes webbed, the 

 tips dilated into larger or smaller disks. Outer metatarsals united 

 or slightly separated. Omosternum cartilaginous ; sternum a carti- 

 laginous plate. Diapophyses of sacral vertebra more or less dilated. 



Cosmopolitan, except the ^Ethiopian Eegion ; one species only in 

 the Palsearctic and two in the Indian. 



Si/nopsls of the Species. 

 I. American Species. 

 A. Derm of head not involved in cranial ossification. 



1. Choanse large ; vomerine teeth in two strong series, 

 forming together a /""\, a H, or a -^. 



a. Fingers half webbed, or more. 



a. A projecting rudiment of pollex *. 



Outer fingers entirely webbed ; skin granu- 

 late above ; heel with a triangular dermal 

 appendage 1. maxima, p. 349. 



Outer fingers half webbed ; upper surfaces 



perfectly smooth 5. faher, p. 351. 



* This rudiment, in form of a tubercle or an acute claw on the inner side of 

 the first digit, is produced by one or two phalanges which are perpendicular 

 to the metacarpal of the pollex ; in the majority of the species these phalanges 

 are absent, or have the same direction as the metatarsals, and are therefore not 

 distinguishable extirnally. 



