1920.] G. A. BouLENGER : Frogs of the Genus Rana. 53 



Measurements, in millimetres, of type specimens. 



I — 7. Khao Sebab, Chantabun, S.E. Siain. 8. Hup Bon, Sriracha, S.E. Siam. 

 9. Meh Song forest, near Prae, N. Siam. 



Habitat. Siam, between 600 and 3000 feet altitude. 



18. Rana plicatella. 



Rana plicatella, 'i>to\\cT.V?i, Jotirn. As. Soc. Beng. XFJI, 1873, p. 116, pi. 

 xi, fig. I ; Bouleng., Cat. Batr. Ecaud. p. 26 (1882) ; S. Flower, Proc. 

 Zool. Soc. 1S99, p. 890; Laidlaw, Proc. Zool.Soc. 1900, p. 885; A L. 

 Butler, 7o«^«- 'V.//. Soc. Bomb. X\', 1903, p. 196; Bouleng., Faun. 

 .Mai. Pen., Rept. p. 231 (1912). 



Vomerine teeth in rather short, strong, oblique series just be 

 hind the level of the choanae. Lower jaw with two fang-like bony 

 prominences in front in the males. 



Head large (male), moderately depressed, a little broader 

 than long, sides of the occiput very convex ; snout obtusely pointed, 

 scarcely projecting beyond the mouth, as long as the ej'c ; canthus 

 rostralis very obtuse ; loreal region moderateh' oblique, feebly con- 

 cave ; nostril equidistant from the eye and the tip of the snout ; 

 the distance between the nostrils equal to the interorbital width ; 

 interorbital region broader than the upper e.velid, convex and fol- 

 lowed by a knob-like prominence; tympanum distinct, as large as 

 or a little larger than the eye, 2 to 3 times its distance from the 

 latter. 



Fingers moderate, the tips dilated into very small but distinct 

 discs, first slightly longer than the second, third as long as the snout ; 

 subarticular tubercles moderate. 



Hind limb long, the tibio-tarsal articulation reaching the tip 

 of the snout, or between the eye and the tip of the snout, the heels 

 overlapping when the limbs are folded at right angles to the body ; 

 tibia 4 times as long as broad, i| to 2 times in length from snout 

 to vent, a little shorter than the fore limb, as long as the foot. 

 Toes moderate, the tips dilated into small but distinct discs, | to ■; 

 webbed, 2 or 3 phalanges of fourth free ; subarticular tubercles 



