A NEW FROG FROIVl SIAM. 105 



As in U, doriae. the males liavt; no vocal sacs, and tliey show no 

 thickening of the inner finger or nuptial rugosities. 



Tliis species is described from a series of specimens from Kiiafi 

 iSebal). Chantabun, S. E. Siam, also one male from the Me iSong foi'est, 

 near Prae, N. Siam, for which I am indebted to Dr. Malcolm Smith. I 

 liad previously received from him a small male from Hup Bon, Sriraclia, 

 S. E. Siam, which 1 was inclined to refer to R. plicatella, which shows 

 a knob-like prominence behind the interorbital region, likewise 

 broader than the upper eyelid ; but no dermal Hap is known to be ever 

 developed in that species, which is, besides, distinguished bj^ the pre- 

 sence of 6 to lit glandular longitudinal folds on the back. 



[This frog has a wide distribution in Siam, and so far has 

 been only found on the hills. On KhaoSebab* it was exceedingly 

 common, living on the banks of the numerous small streams with 

 which this liill is supplied. It was found at all elevations, and above 

 2000 feet, was the only batrachian met with during our shoi-t staj^ 

 there. Hup Bon, some 80 miles to the N. E., is about 600 feet above 

 sea-level, but is not a hill. It is evidently rare there, as 1 could never 

 obtain any more specimens from tli.at lin:ality. ' On tlio hills north of 

 Utradit ( Khao Pieung j and also on tliose nortli of Prae (Me Song 

 forest) it was again found to be plentiful. 



On Khao Sebab at the end of March, many young ones 

 just emerging from the water were met with', and females with 

 ripe ova were also obtained, i brought several adults back with me on 

 that occasion, and they are still thriving (November), living on the 

 usual frog diet. The flap on the head is, presumably, for sexual 

 .•rii.'vmHntation. It is not erectile, and in life is kept clo.«ely applied 

 t(i the head. .M..\,S.] 



» KliM.. =- liill. Alt. :lO(ii) rr. 

 \i'i., II. in-.c. i:mi;. 



