222 



- DR. MALCOLM SMITH ON 



Rana pileata Boulenger. 



Plate 9, fig. 4. 



Rana pileata, Bouleng., Journ. N. H. Soc. Siam, 1916, ii, p. 52, 

 pi.—; idem., Rec. Ind. Mus., 1920, xx, p. 52. 



This form is the largest of the group, and it has diverged the 

 furthest from the primitive form. In it the head attains a remark- 

 able development, for in addition to the usual cranial enlargement, 

 the postorbital swelling becomes produced as a rounded flap, free 

 behind and at the sides. I have nothing to add to Boulenger's ex- 

 cellent description of this species. 



Type locality. Khao Sebab, Chantabun, S. E. Siam. Types 

 in the British Museum. 



Measurements of R. pileata in mm. 



JOURN. NAT. HIST. SOC. SIAM. 



