18 INTRODUCTION. 



A. Pupil round, subtriangular, or corcliform. 



1. Vomerine teeth in long transverse series; 



tympanum distinct or concealed under the 

 skin .... 1. Discoglossus pictus. 



2. Vomerine teeth in two groups; no tym- 



panum. 

 Tibia shorter than the foot 



2. Bombinator igneus. 

 Tibia as lone: as or a little longer than the 

 foot .... 3. Bombinator pachypus. 

 p.. 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. Alytes cisternasii. 



II. Tongue circular, entire or slightly notched, and 



free behind ; vomerine teeth between the 



choanal ; pupil vertical (Pelobatid.e). 



a. Tympanum distinct or concealed under the 



skin ; toes webbed at the base and bordered ; 



inner metatarsal tubercle small, soft 



(I. Pelodytes punctatus. 

 p,. No tympanum ; 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. Pelobates fuscus. 

 Interorbital space and occiput flat; metatarsal 

 tubercle black . 8. Pelobates cultripes. 



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

 no teeth ; pupil horizontal (Bufonid^e). 

 Toes at least nearly half webbed, with paired 

 subarticular tubercles ; no tarsal fold ; inter- 



