Batrachians of the Province Rio Grande do Sal. 439 



Crotalus, L. 



Crotalus horridus. 



Crotalus horridus, Linn. S. N. i. p. 372 ; Wied, Abbild. ; Dum. & Bibr. 

 vii. p. 1472 ; Hens. I. c. p. 338 ; Jan, Icon. Oph. 46, pi. iii. figs. 1 & 2. 



BATRAGHIA. 



ECAUDATA. 



EngystomatidsB. 



Engystoma, Fitz. 



Engystoma ovale. 



Rana ovalis, Scbn. Hist. Amph. p. 13. 



Engi/stoyna ovale, Fitz. N. Class. Rept. p. 65 ; Dum. & Bibr. viii. p. 741 ; 

 Hens. Arch. f. Nat. 1867, p. 140 ; Bouleng-. Cat. Batr. Ecaud. p. 163, 

 Oxyrhynchus bicolor (Val.), Guer. Icon. R. A., Rept. pi. xxvii. fig. 2. 



B. M. ; V. I. 



Cystignathidae. 



A. Toes webbed ; pupil borizontal. 



a. Toes entirely webbed ; outer metatarsals separated by 



web ; habit ranoid Pseudis. 



b. Toes webbed at the base ; outer metatarsals united ; 



habit stout Ceratophrys. 



B. Toes free. 



1, Pupil horizontal. 



a. Digits dilated into regular disks ; vomerine teeth . . Hylodes. 



b. Vomerine teeth absent (or situated between the 



choanae) ; tympanum indistinct or hidden Paludicola. 



c. Vomerine teeth situated behind the choanae ; tympa- 



num very distinct Leptodactylus. 



2. Pupil vertical Limnomedusa. 



Pseudis, Laur. 

 Pseudis mantidactyla. 



Lysapsus mantidactyla, Cope, Proc. Ac. Philad. 1862, p. 352. 



Pseudis mantidactyla, Bouleng. Cat. p, 187, and Ann. & Mag. Nat. Hist. 



(5) xi. 1883, p. 17. 

 ? Pseudis paradoxa, Cope, Proc. Amer. Philos. Soc. xxii. (1885) p. 187. 



B. M. ; V. 1. 



Ceeatopheys, Wied. 



a. Upper eyelid with several pointed papillae ; a large bony 



swelling on each side of the crown bigibhosa, 



b. Upper eyelid produced into a horn-like appendage ; a 



bony dorsal shield dorsata. 



c. Upper eyelid simple ; inner metatarsal tubercle sharp- 



edged ; no dorsal shield americana. 



30* 



