IXALUS. 481 



73. Rhacophorus cavirostris. 



Polypedates cavirostris, G'tinth. P. Z. S. 1868, p. 486, pi. xxxix, 



fig. 1. 



Ixalus timbriatus, 'Giinth. A. M. N. H. (4) ix, 1872, p. 87. 

 Rhacophorus cavirostris, Bouleng. Cat. Batr. Sal. p. 82. 



Vomerine teeth iii two small groups between the choanse. 

 Snout rounded, as long as the diameter of the orbit ; canthus 

 rostralis angular ; loreal region deeply concave ; nostril much 

 nearer to the tip of the snout than to the eye ; interorbital space 

 as broad as the upper eyelid or broader ; tympanum nearly half 

 the diameter of the eye. Fingers slightly, toes almost entirely 

 webbed ; disks about two thirds the diameter of the eye ; subarti- 

 cular tubercles moderate. The tibio-tarsal articulation reaches to 

 between the eye and the tip of the snout. Upper parts with small 

 tubercles ; a fold above the tympanum ; outer edge of forearm and 

 tarsus with a denticulate fringe ; a patch of conical tubercles 

 below the vent ; belly and underside of thighs granular. Reddish 

 brown above, marbled with dark brown and speckled with black ; 

 limbs with dark cross bands ; sides of thighs not coloured ; throat 

 dotted with brown. Male with internal vocal sacs. 



From snout to vent 2 inches. 



Hob, Ceylon. 



Genus IXALUS, 

 Dum. & Bibr. Erp. Gen. viii, p. 523, 1841. 



Pupil horizontal. Tongue free and deeply notched behind. 

 Voineriue teeth none. Tympanum distinct or hidden. Fingers 

 free or webbed at the base ; toes webbed ; tips of fingers and toes 

 dilated into regular disks. Outer metatarsals separated by a groove 

 or narrow web. Omosternum and sternum with a bony style. 

 An intercalary ossification or additional phalanx between the pen- 

 ultimate "and distal phalanges ; the latter obtuse. 



Distribution. The head-quarters of this genus are in Southern 

 India and Ceylon, which yield 14 out of the 20 known species, 

 the rest being from Burma, Indo-China, and the Malay Peninsula 

 and Archipelago. 



U of Indian, Ceylonetse, and Burmese Species. 



A. Tongue without conical papilla. 



a. Tympanum perfectly distinct, half diame- 



ter of eye. 



'. Heel without dermal appendage. 

 a". Toes two-thirds webbed ; disks very 



small .......................... /. vxyrhynchus, p. 482. 



b". Toes one-third or half webbed ; disks 



well developed .................. /. leucorhinus, p. 483. 



b'. Heel with a triangular or subconical 

 dermal appendage ; upper parts with 

 large conical warts ................ /. schmardanus, p. 483. 



2i 



