198 Mr. W. T. Blanford's Zoological Notes. [No. 3, 



differences in colour. Now I have seen whole herds (or sounders) of 

 wild pigs which were brown in colour, irrespective of size or sex, and 

 other herds in the same region, all the members of which were black. 

 Large hogs are usually black, becoming grizzled with age, but I have 

 seen a large solitary hog of the brown species, which had been just 

 killed by a friend, and it was the same colour as the smaller animals. 

 The brown race, so far as my observations extend, is never found 

 except in bush or forest jungle, the black pigs are the common wild 

 hog of the plains, but are also frequently met with in forest. These 

 may be accidental varieties, but it is equally probable that the 

 dfference in colour is connected with other distinctions. I can, 

 however, only point out the question as one for enquiry. 



Rodentia. 



10. The Burmese bamboo rat, Rhizomys castaneus, Blyth. — In 

 the Catalogue of mammalia in Mus. As. Soc. the locality of a specimen 

 received from me is erroneously entered as South Arakan. The speci- 

 men was killed by me at Prome in Pegu. The distinction is 

 important, as the fauna of S. Arakan, and of Arakan generally, is 

 very different from that of Upper Pegu, though many species, like the 

 present, are common to both. 



Cetacea. 



11. The freshwater dolphins of India and Burma (JPlatanista). 

 It is well known that species of JPIatanista — whether the same or 

 distinct, is less clearly ascertained, occur in the Ganges and Brahmaputra 

 and in the Indus. It is less generally known that a species abounds 

 in the Irrawadi. I have seen them in various parts of that river from 

 near the mouth to nearly 100 miles above Ava, and I was told by 

 natives that they are to be met with as far to the north as Bamo, the 

 Burmese frontier. I was, however, never able to obtain a specimen. 

 The species is very likely to differ from that of the Ganges. 



I cannot say if these animals are found in any other Burmese rivers. 

 They may very likely exist in the great rivers of Siam and Cambodia, 

 and they should be looked for in the great Chinese rivers. I am pretty 

 certain that in India they are only found in the Ganges, Brahmaputra, 

 and Indus, and their tributaries. I can speak pretty certainly of their 

 non-existence in the Brahmini, Mahanadi (of Cuttack), Godavery, 

 Taptee and Nerbudda, and I never heard of their occurrence in the 

 Krishna or Cauvery. 



