276 journal of the F.M.S Museums. I Vol. X, 



for some slight differences in measurements, the males do 

 not differ in any important character from the type 

 specimen except in having a more prominent, glandular 

 dorso-lateral fold. Females arc considerably larger. 



Two of the males (Nos. 6532, 6534) from Eraser's 

 Hill are coloured as follows : — Bright green on the back, 

 sides of body and limbs above brown, the latter with darkish 

 crossbars ; below white. Two females from the same 

 locality (Nos. 6535-6) are purplish brown above and on 

 the sides ; below whitish, the throat, chest and under surface 

 of limbs heavily powdered with brown. 



Eggs large and unpigmented, 2-5 mm. in diameter. 



Rana cataracta is closely allied to R. hosii Blgr., and 

 R. livida (Blyth) .* From the former it differs in the larger 

 tympanum, more coarsely granulate skin, and very 

 distinctly in colouration. From the male of R. livida, with 

 its prominent bladder-like external vocal vescicles, it is 

 easily distinguished. The females of the two, except for 

 some slight differences in colouration appear to be 

 indistinguishable from each other. 



From R. chalconata (Schleg.) another near ally which 

 agrees exactly with it in colouration, and which was found 

 in company with it on Khao Bam, it differs in the longer 

 hind limb, more fully webbed toes and in the absence of 

 the small external metatarsal tubercle. 



Remarks. This new frog was first discovered on Khao 

 Ram, on the banks of a stream famous for its scries of 

 magnificent waterfalls. It was common at 300 metres 

 altitude, at a couple of large pools where we were camped 

 for some days, but was not found on two other hills in the 

 same range visited on the same trip. 



Its habits were those of a true tree frog, perching high 

 up in bushes, or on the trunks of trees, or hopping about 

 on the rocks beside the swiftly flowing water. The call of 

 the male, heard at night only, was a short whistling cry, 

 sometimes almost a scream, and by it they could be tracked 

 down with a lantern and caught. 



The Rami livida obtained by Wray in the Larut Hills, 

 Perak, should possibly be referred to this species. 



* Also to /?. graminea, Blgr., which appears to differ from 

 livida chiefly in the presence of a more or less defined glandular 

 dorso-lateral fold. Originally described from Hainan, this frog 

 has since been found to be widely spread over Siam and Indo- 

 China. I strongly suspect the two will have to be united. 



