E1JACOPHOEUS. 471 



c' '. Upper surfaces finely granulate ; heel with a 



dermal appendage R. malabaricus, 



b. Vomerine teeth in two oblique series between [p. 473. 



the choanae. 

 a'. Upper surfaces with small warts, throat 



granulate R. beddomii, p. 473. 



b'. Upper surfaces and throat smooth R. lateralis, p. 473. 



c. Vomerine teeth in two widely separated small 



rounded groups, close to internal angle of 



choanae R. tuberculatus, 



B. Fingers not half webbed. [p. 474. 



a. Tympanum more than half diameter of eye. 

 a'. Heel without dermal appendage. 



a". No parieto-squamosal arch ; head usually 

 rugose, with skin adhering to fronto- 



parietal bones R. leucomystaa; 



b". A more or less distinct parieto-squamosal [p. 474. 



arch, 

 a. Skin of head free ; disk of 3rd finger 



not more than half diameter of eye . . R. maculatus, 

 IB. Skin adherent to nasal and frontoparietal [p. 475. 



bones ; disk of 3rd linger at least 



half diameter of eye R. cruciyer, p. 476. 



b'. Heel with a dermal appendage. 



a". Snout not twice as long as diameter of eye. R. eques, p. 476. 

 b". Snout twice as long as diameter of eye. . R. nasutus, p. 477. 



b. Tympanum not more than half diameter of eye. 

 '. Tongue with a free pointed papilla on 



median line. 



a". Diameter of eye equal to its distance 

 from nostril, and twice diameter of 



tympanum R. reticulatus, 



b". Diameter of eye more than its distance [p. 477. 



from nostril, and more than twice 

 diameter of tympanum. 

 a. Web scarcely developed between inner 



toes R. dubius, p. 477. 



/3. Web embracing at least half length of 



inner toes R. nanus, p. 8. 



//. Tongue without 



a". Fingers very distinctly webbed. 

 a. Tibio 



io-tarsal articulation reaching pos- 

 terior border of orbit ; hinder side of 

 thighs not coloured ................ R. jerdonii, p. 478. 



|3. Tibio-tarsal articulation reaching centre 

 of eye or beyond ; hinder side of thighs 

 brown, speckled with white ........ R. plenrostictus, 



b". Fingers with a very slight rudiment of [p. 479. 



web. 

 a. Snout not longer than diameter of orbit ; 



tympanum not half diameter of eye. 



a'. Vomerine teeth in two oblique groups [p. 479. 



between choanse ................ R. microtympanum, 



(3 1 . Vomerine teeth in two small groups [p. 480. 



close to inner front corners of choanse. R. stictomerus, 



