252 EANID^. 



belly and under the thighs ; a strong dermal fold along the outer 

 edge of the forearm and tarsus, at the heel, and above the vent. 

 Colour in life green above, powdered with white or with lichen- 

 like white markings ; one or two conspicuous white spots on the 

 upper surface of tlie thigh ; flanks yellow or orange, veined with 

 black ; interdigital membranes black at the base, yellow or orange, 

 veined with black, towards the border ; throat and chest cream- 

 colour, belly and lower surface of limbs salmon-pink, sometimes 

 dotted over ^ith yellow. 



Prom snout to vent 100 millim. 



Malay Peninsula (Perak, Jalor, Ulu Legeh), Sumatra, Borneo. 



This is probably the species alluded to by Wallace (Malay 

 Archipelago, i, p. 60) as the " flying-frog " of Borneo. Mr. Robin- 

 son, who took a specimen at Mabek, Jalor, noted that it dropped 

 almost vertically from a tall tree growing at the edge of a large 

 clearing in the jungle. Beyond the statement of the Chinaman 

 who procured Wallace his specimen, there is no evidence to prove 

 that the so-called flying-frog uses its webbed hands and feet as a 

 parachute to support itself in the air. 



Genus IXALUS. 

 Dam. & Bibr. Erp. Gen. viii, p. 523 (1841). 



Pupil horizontal. Tongue free and deeply notched behind. 

 Vomerine teeth none. Tympanum distinct or hidden. Fingers 

 free or more or less webbed; 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 between the penultimate and 

 distal phalanges ; latter obtuse or bifurcate. 



South-Easteru Asia. Represented by seven species in the Malay 

 Peninsula. 



Arboreal frogs, differing from the preceding by the absence of 

 vomerine teetli. Mostly of small size. 



Si/no2>sis of tlie Species. 



I. Fingers free or with a rudiment of web. 

 A. Upper parts .smooth or nearly so ; tym- 

 panum, if distinct, not more than half 

 diameter of eye ; throat granular. 



1. Tympanum not very distinct, or bidden ; 



fingers quite free. 

 Tibio-tarsal articulation reaching posterior border 



of eye /. brevipes, p. 253. 



Tibio-tarsal ai'ticulation reaching between eye 



and end of snout 1. lanttensis, p. 2o3. 



Tibio-tarsal articulation reaching end of snout . . /. castanomeriis, 



2. Tympanum very distinct ; fingers Avitli LP* ^'^^' 



a rudiment of web /. venm'cnlatus, 



[p. 254. 



