434 



DR. M. A. SMITH ON REPTILES AND 



throat is pigmented, and sufficiently differentiated, to entitle 

 the sacs to be called external. 



In general appearance R. nigrovittata very closely resembles 

 R. mortenseni from S.E. Siam. R. mortenseni, however, has no 

 groove at all to the finger discs, grows to a larger size, and the 

 male has internal vocal sacs. Adult males cannot be confused, 

 but immature specimens or females could be mistaken. R. mor- 

 tenseni appears to be confined to the Island of Chang. The 

 specimens identified by Boulenger as having been obtained in the 

 Karin Hills (N. Siain), Monograph, No. 5 & 6, p. 136, should, I feel 

 sure, be referred to nigrovittata. The tadpole also, as originally 

 described by me under nigrovittata, should stand as correct. 



I give measurements of some specimens in the British Museum 

 which I have examined. 



Ran a sauteri Boulenger. 



Bee. Ind. Mus. xx. p. 143, June 1920. 

 Yar. johnsi, nov.* (PI. II. fig. 1.) 



Eleven specimens of a frog from the Plateau differ sufficiently 

 from R. sauteri Boulenger, from Formosa, to be entitled to 

 racial distinction. I have compared them with types in the 

 British Museum, and separate them on the following grounds : — 



More pointed snout, longer leg, tibio-tarsal articulation to well 

 beyond the snout, very prominent glandular dorso-lateral fold, 

 and smaller size. 



In other points also, Boulenger's description, drawn up from 

 four females, shows small variations, and I therefore describe my 

 specimens in detail. 



Vomerine teeth in oblique groups between the choanal and 

 extending beyond their posterior borders, as far from the choanse 

 as from each other, or a little farther. 



Head as long as, or a little longer than broad, depressed ; 

 snout obtusely pointed, projecting beyond the mouth, longer than 



* Named after Mr. Johns, British Consul in Saigon at the time of our visit, and 

 who was of the greatest assistance to us in arranging many details of our expedition. 



