1909.] R. E. lyLOYD : The Races of Indian Rats. 11 



Measurements of skulls of " types " of Malay species {Bonhote). 



As regards these measurements, therefore, the three Malay 

 species also fall within the range of variation exhibited by the rats 

 of Calcutta. 



A number of species have recently been described from the 

 Andamans. Measurements of the ''types" of these show a 

 similar range of variation, if examined in the same way. 



Measurements of skulls of " types " of species from the 

 Andamans (G. S. Miller). 



With the exception of the breadth in M. flebilis and burrus 

 these measurements are all within the range of variation exhibited 

 by the fort^'-five Calcutta rats. 



The new species M. stoicus and taciturnus from the Andamans, 

 are short-tailed rats of large size, not of the rattus type, and have 

 therefore been excluded. 



As regards these important measurements the " types " of all 

 these species scarcely exhibit a wider range of variation than that 

 shown by forty-five Mus rattus taken from a single town. It is not 

 likely that the smaller details such as the shape of the nasal bones, 

 zygomatic plates, tympanic bullae, and the like, will be of value as 

 distinguishing marks of races. The skulls of fifty rats taken from 



