EANA. 227 



Cosmopolitan, except in the Southern parts of South America, 

 in Australia and Xew Zealand. 



Some species are chiefly terrestrial, others aquatic, others 

 arboreal. Arboreal habits are usually to be recognized by the 

 distal enlargement of the digits, although some strictly aquatic 

 forms, such as R. IcuJiUi, have the toes ending in small but very 

 distinct disks. 



This genus is represented by 22 species in the Malay Peninsula. 



Synopsis of the Species. 



I. No glandular dorso-lateral fold * ; digits 

 with the tips not or but feebly dilated. 



A. Toes acutely pointed, very broadly 



webbed ; inner metatarsal tubercle 



conical -R. cyanophlyctis, p. 228. 



B. Toes blunt or with dilated tips. 



1. Tympanum indistinct or hidden; 



toes at least f webbed. 

 Tibio-tarsal articulation not reacbiug beyond 



eye ; tympanum hidden R. huhlii, p. 229. 



Tibio-tarsal articulation to between eye and 



tip of snout; tympanum scarcely distinct. . JR. laticeps, p. 230. 



2. Tympanum very distinct. 



"a. Vomerine teeth commencing on 



a line with the hinder edge of 



the clioanfB ; tips of fingers and 



toes dilated into small disks. 



Toes nearly entirely webbed ; skin smooth or 



with irregular glandules on tlie back E. dories, p. 231. 



Toes f to I webbed ; skin of bacli with regular 



longitudinal folds R. plicatella, p. 231. 



Toes 5 to 5 webbed ; no dorsal folds R. hascheatia, p. 232. 



h. Vomerine teeth between the 



choanpe, or commencing from 



the anterior corner of the latter. 



a. Tips of fingers not dilated. 



Toes broadly webbed, with distinctly swollen 



tips ; skin smooth above, or with small 



warts R. macroclon, p. 233. 



Toes broadly webbed, obtuse ; skin Avarty, 

 the warts usually forming longitudinal 



folds R. tiffrina, p. 234. 



Toes half webbed ; skin warty, the warts 



usually forming longitudinal folds R. limnocharis, p. 236. 



/3. Tips of fingers and toes dilated 

 into small disks. 

 Toes ^ to f webbed ; first finger much longer 

 than second ; back with flat warts, at least 

 on the sides R. glandulosa, p. 236. 



* Except in young R. macrodon. 



q2 



