MAMMALS MARTI3STAE PUTORIUS LONGICAUDA. 



171 



Measurements. xWu Milk river, Nebraska. 



Smaller specimens from the Missouri river and west differ from P. noveboracensis in a greater 

 extent of the light color on the belly, and in having this of a very decided pale saffron yellow. 

 The chin and under surface of the head, however, are white. The upper parts are lighter, and 

 with a greenish tinge. Winter specimens are pure white, with black tip to the tail. 



Their general appearance is much the same with that of number 225, although they are 

 smaller ; the shade of brown above, and other features, are very similar. There is nearly the 

 same indistinctness in the line of separation between the colors of the back and belly, the more 

 yellowish tinge generally. The light color of the belly is considerably wider in all these than 

 in P. noveboracensis. 



If all the specimens of long tailed ermines from the Missouri region differ from the New 

 York species, as I am inclined to suspect, then it is the more probable that they are the same 

 with the Carlton House variety with long tail, referred to in Richardson's Fauna Boreale- 

 Americana, as quoted above. I have little doubt that the two large species I describe are 

 different ; should they prove the same, however, then Bonaparte's name must be retained as 

 having' priority. 



List of specimens. 



