278 A NEW SNAKE AND A NEW FROG FROM SIAM. 



and toee dilated into small but well developed discs. Subarticular 

 tubercles well marked, a small, oval inner, and a small but ijuite dis- 

 tinct rounded, outer, metatarsal tubercle. The tibio-tarsal articulation 

 reaches bej'ond the tip of the snout, the heels overlap when tlie 

 knee is fully flexed. Skin coarsely granular above, ver}' coarsely f^ran- 

 ular upon the sides. A narrow and very prominent glandular dorso- 

 lateral fold. 



Males with external vocal vescicles and a large rounded gkuid 

 on the inner side of the elbow. 



Colour. Light olive ( greyish in alcohol ) above and on the 

 sides, with an irregular chain of small black spots along each flank. 

 Limbs with dark cross-bars, thighs behind marbled with dark brown. 

 Below whitish. A dark streak along the canthus rostralis, and dark 

 spots upon the lips. T^-mpanum dark brown. 



Ti/pe lucalittf. Uoi Nga Chang, N. Siaui. Type and para-type, 

 adult males. Author's numbers, LIOC and 2.107 respectively. Col- 

 lected on the banks of a small stream, February, 1917, at about 500 

 metres elevation. 



Dimensions in millimetres. 



Type I'ara-type. 



Snout to vent G8 G(i 



Length of head (tympanum to end of snout) ... 23 23 



Breadth of head 21 19.5 



Snout 9.5 9.5 



Eye " 7 7 



Tympanum 



Elbow to tip of 3rd finger ol 25 



Tibio-tarsal articulation to tip of 4th toe 53 50 



The type will be presented to the British Museum. 



JOUHX. NAT. HIST. SOC. SIAM 



