EXPLANATION OF PLATE IX. 
Above.—Itter of four young rats and an adult, which were 
caught at Poona. All of them have a white breast mark. The four 
young ones are of the same litter but it is uncertain whether the 
large one is their parent or not. 
Below.—Tails of rats caught in Naini Tal. The uppermost is 
the tail of a common rat and is equally pigmented in its whole 
circumference. The second from above is pigmented in the whole 
of the dorsal surface. In the other four the dorsal pigmentation 
extends up to or not quite so far as the middle. The length of 
the hair is variable, and has not been studied. 
