18 INTRODUCTION. 



A. Pupil round, subtriangular, oi^ coi^diform. 



1. Vomerine teetli in long transverse series; 



tympanum distinct or concealed under tbe 

 skin .... 1 . Discoglossus f ictus. 



2. Vomerine teetli in two groups; no tym- 



panum. 

 Tibia shorter tlian the foot 



2. Bombinator igneus. 

 Tibia as long as or a little longer than the 



foot .... 3. Bomhinator pacliypus. 



B. Pupil vertical ; vomerine teeth in short trans- 



verse or slightly oblique series ; tympanum 



distinct. 

 Three palmar tubercles ; fourth finger as long 



as or slightly shorter than second 



4. Alytes obstetricans. 

 Two palmar tubercles ; fourth finger much 



shorter than second 5. Ali/fc8 cisternasii. 



II. Tongue circular, entire or slightly notched, and 

 free behind ; vomerine teeth between the 

 choanffi ; pupil vertical (PELOBATiDiE). 



A. Tympanum distinct or concealed under the 



skin ; toes webbed at the base and bordered ; 

 inner metatarsal tubercle small, soft 



6. Felo(l]ifcs 'punctatiis. 



B. No tym]:)anum ; toes nearly entirely webbed ; 



inner metatarsal tubercle large, hard, com- 

 pressed, sharp-edged. 

 Interorbital space and occiput convex ; meta- 

 tarsal tubercle yellowish or pale brown 



7. Pelobnie>< fuscus. 

 Interorbital space and occiput flat; metatarsal 



tubercle Ijlack . 8. Pelobafes cultri2jes. 



III. Tongue elliptical or pyriforra, entire, free behind ; 

 no teeth ; pupil horizontal (BcjkoniDje). 

 Toes at least nearly half webbed, with paired 

 subarticular tubercles ; no tarsal fold ; inter- 



