IXALTJS. 481 



73. Rhacophoriis cavirostris. 



Polypedates cavirostris, Giinth. P. Z. S. 1808, p. 48t), pi. xxxix, 



tig. 1. 

 Ixalus timbriatus, Giinth. A. M. X. R. (4) ix, 1872, p. 87. 

 Rhacoplioi'us cavirostris, Bouleng. Cat, Batr. Sal. p. 82. 



Vomerine teeth iu two siuall groups between the choau^e. 

 Snout rouucled, as long as the diameter of tlie orbit ; canthus 

 rostralijs 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 eve. Fingers slicrhtlv, 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. Keddish 

 brown above, marbled w ith dark brow n and speckled with black ; 

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

 dotted with brown. Male with internal vocal sacs. 



From snout to vent 2 inches. 



Hah. Ceylon. 



(lenus IXALUS. 

 Diuu. ».<: Bibr. Erp, (ieii. viii, p. o'2'-j, 1841. 



Pupil horizontal. Tongue free and deeply notched behind. 

 Vomerine teeth none. Tympanum distinct or hiddeu. 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. Oinosteriuim and sternum with a bony stvle. 

 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 beiug from Burma, Indo-China, and the Malay Peninsula 

 and Archipelago. 



>Si/no2)sis of Indian, Ceylonese, and Burmese Species. 



A. Tong'ue without conical papilla. 



a. Tympanum ])erfectly distinct, half diame- 

 ter of eye. 

 a. Heel without dermal appendage. 

 a". Toes two-thirds webbed; disks very 



small /. oxyrhynclms, p. 482. 



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



well developed 1. leucorldnus, p. 483. 



b' . Heel with a triangular or subcorneal 

 dermal appendage ; upper parts with 



large conical warts /. schmardanus, p. 483. 



2l 



