148 
ZOOLOGY OF THE FAR EAST. 
and there is a distinct emargination in the centre of the lower margin of the posterior 
lip. The dental formula is i : 34-3/1 + 1 : 2. The second row of teeth on the upper 
lip and the first on the lower lip are very slightly interrupted. The beak is black, 
except at the base of the lower mandible, where it is brownish. The upper beak is 
narrowly crescentic and minutely serrated. The lower beak, which is much broader, is 
V-shaped ; it is also serrated. So far as colouration is concerned, the tadpoles resemble 
those of R. macrodon in the dark bars on the tail and blotches on the body, but while 
in the larva of R. macrodon the ventral surface of the body is entirely unpigmented, 
in the present species it is closely covered with short microscopic hair-like dark lines, 
which run in all directions without crossing one another. 
Measurements : — 
Length of body . . . . . . . . 10-5 mm. 
Breadth of body . . . . . . . . 6 ,, 
Length of tail . . . . . . . . 18 
Depth of tail . . . . . . • • 3 5 
Rana macrodon, D. and B. 
1912. Rana macrodon, Boulenger, Fauna Malay Peninsula, Rept., p. 233. 
Larva. 
1899. Rana macrodon, Flower, Proc. Zool. Soc. London, p. 889, pi. LIX, fig. i. 
In a small jungle-stream on Penang Island I found in February 1916 a number of 
young frogs and tadpoles of this species. The older tadpoles agree well with Flower's 
figure, but the younger ones are less conspicuously marked. In the uncertain light 
of the jungle the dark bars and blotches form an excellent protective colouration on 
a sandy bottom. Tadpoles of R. lunnocharis from streamlets on the Peak of Hong- 
kong closely resembled this species in colouration (except that they were less yellow) 
and were equally well hidden. 
The larvae of R. macrodon evidently obtain their food by swallowing large quan- 
tities of sand, as their intestines are filled with that substance. They probably avoid 
the rocky parts of the stream in which they live. 
Measurements : — 
Length of body . . . . . • • 9'5 ^t^- 
Breadth of body . . . . . . . . 6 ,, 
Length of tail , , , . . . , . 19 ,, 
Depth of tail . . . . , . • ■ 4'5 
Rana labialis, Boulenger. 
(Plate VI, fig. 5.) 
1912. Rana labialis, .Boulenger, op. cit., p. 242. 
L-'VRVA. 
1896. Rana labialis. Flower, Proc. Zool. Soc. London, p. 903, pi. xlv, fig. 3. 
In a small rocky pool at the edge of a stream at the base of the hills near 
Taiping I found in January 191 6 a number of tadpoles that seem to be identical 
