214 REPTILES AND BATRACHIANS FROM SIAM AND INDO-CHINA. 



externally. In colouration the frogs from this region are of a 

 richer brown than those found further north, and there is often a 

 clearly defined broad dark band along the side of the body. Below 

 whitish. (30 specimens examined). 



(2) From N. E. Siam and French Laos. A larger form, up 

 to 70 mm. in length. Colouration greyer, and with the lateral band 

 always broken up. Below often dappled or heavily powdered with 

 grey. Vocal sacs feebly developed 'externally. (55 specimens 

 examined). 



(3) Koh Chang (R. mortenseni). A large form, 70 mm. 

 in length. Males with internal vocal sacs. (7 specimens examined). 



The types of Rana nigrovittata are in the Indian Museum, 

 Calcutta. Type locality Pegu. 



Microhyla butleri Boulenger. 



Microhyla butleri, Bouleng., Faun. Malay Penin., Kept., 1912, 



p. 261. 

 Microhyla latastii, Bouleng., Ann. & Mag. Nat. Hist., July 1920, 



(2) vi, p. 106. 



I have examined the types and only known specimens of 

 M. latastii in the British Museum, but cannot distinguish them from 

 examples of M. butleri. 



This latter frog is widely distributed throughout Siam and 

 Indo-China and I have examined numbers of specimens, both alive 

 and dead. Its colouration is variable, but the dark, white-edged, 

 3-tiered mark on the back is usually more or less distinguishable. 



JOURN. NAT. HIST. SOC. SIAM. 



