1920.] G. A. BouLENGER : Frogs of the Genus Rana. 129 



carried out as far as it is possible in a group which is manifestly 

 of polyphyletic origin. 



The species may be grouped under ten sections : — 



A. Ranae HOiySTiANAE. Fingers simply obtuse, not at all 



dilated at the end : a projecting rudiment of pollex ; 

 discs of toes small. 

 R. holsti. 



B. Ranae CURTiPEDES. An aberrant type, answering, accord- 



ing to individuals, the definition of both Rana and Hylo- 

 rana. 

 R. cur tip es. 



C. Ranae graciles. Fingers with swollen or dilated tips 



without the groove which is present on the feebly dilated 



tips of the toes. 

 R. gueniheri, R. mortenseni, R. latouchii, R. cuhitalis, R. adeno- 

 pleura, R. gracilis, R. elberti, R. sauteri, R. nigrovittata, R. 

 leptoglossa. 



D. Ranae EryThrEae. Fingers with discs similar to and not 



larger than those of the toes, which are not twice as 

 broad as the penultimate joint ; transverse distal expan- 

 sion of terminal phalanx feeble ; dorso-lateral fold present. 

 R. humeralis, R. miopus, R. oatesii, R. erythraea, R. macrodactyla, 

 R. aurantiaca, R. sanguinea, R. temporalis, R. fiorensis, 

 R. nicohariensis , R. varians, R. alticola, R. celebensis, R. 

 garoensis, R. nasica. 



E. Ranae i^uctuosaE. As in the preceding, but dorso-lateral 



fold absent or reduced to a chain of large warts, 

 R. arfaki, R. andersonii, R. schniackeri, R. ijimae, R. signata^ 

 R. picturata, R. nioellendorffi, R. glandulosa, R. baramica, 

 R. luctuosa, R. debussyi. 



F. Ranae papuae. As in D, but discs of toes at least twice 



as broad as the penultimate joint. 

 R. grisea, R. krefftii, R. papua, R. daemeli. 



G. Ranae swinhoanae. As in the preceding, but dorso-lateral 



fold incomplete. 

 R. swinhoana. 



H. Ranae jerboae. As in F, but hind limb extremely elon- 

 gate and dorso-lateral fold present or absent. 

 R. cavity mpanum, R. whiteheadi, R. jerboa. 



I. Ranae chai^conotae. Fingers with discs similar to those 

 of the toes, but larger, with the transverse limb of the 

 T-shaped terminal phalanx well developed, but not longer 

 than the longitudinal limb ; dorso-lateral fold present 

 or absent. 



