20 



St/ 1 tops in of (re It era. 



Pupil horizontal ; tongue more or less deeply emarginate ; vomeiine 

 teeth ; fingers perfectly free, toes webbed ; outer metatarsals separated 

 hj web ; omosternum and sternum with a bony style. 



1. Rana, p. 20. 



Characters of Rana, but the fingers more or less webbed. 



2. Rhacophorus, p. 29. 



Pupil horizontal ; tongue deeply emarginate ; vomerine teeth none ; 

 outer metatarsals separated by a groove or narrow web ; omosternum 

 and sternum with a bony style. 3. Ixalus, p. 33. 



Pupil vertical ; tongue deeply emarginate ; vomerine teeth ; toes 

 webbed ; outer metatarsals separated by a web ; omosternum and 

 sternum with a bony style. 



4. Nyctibatrachus, p. 39. 



Pupil vertical ; tongue rather deeply emarginate ; vomerine teeth ; 

 toes free ; outer metatarsals separated by a groove ; omosternum and 

 sternum slender, cartilaginous. 5. Nannobatrachus, p. 39. 



1. RANA. 



Synopsis of Species. 

 A, Fingers and toes acufc/f/ poiitfed, the latter very broadly xcehhed. 



First finger extending a little beyond second. 



1. hexadactyla, p. 21. 



First finger not extending beyond second. 



2. cyanophlyctis, p. 22. 



B- Finger pointed or blunt ; toes blunt or slightly dilated at the tips. 



1. Toes more than half webbed. 



a. Tympanum hidden, first finger extending a little beyond second ; 

 upper eyelid rather narrow. 3. kuhlii, p. 22. 



b. Tympanum perfectly distinct. 



A much developed membranaceous fringe along the outer side of 

 the fifth toe ; interorbital space narrower than the upper eyelid. 



4. tigrina, p. 23. 



Tibio-tarsal articulation reaching the tip of the snoat^ ; upper parts 

 strongly warty. 5. verrucosa, p. 25. 



2. Toes not more than half webbed. 



Inner metatarsal tubercle blunt. 6. gracilis, p. 24.- 



Inner metatarsal tubercle shovel-shaped ; tarso-metatarsal articula- 

 tion reaching a little beyond the tip of the snout. 



7. rufescens, p. 25. 



Inner metatarsal tubercle shovel-shaped ; tympanum two-thirds the 

 size of the eye, 8. dobsonii, p. 26. 



Inner metatarsal tubercle shovel-shaped ; tympanum half the size of 

 the eye. 9. bnviceps, p. 25. 



1 This measui-ement is estimated by drawing the hind limb forwards. 



