76 Merriam New Mammals from the United States. 

 Cranial measurements of Island Foxes. 



Putorius streatori leptus subsp. nov. 



Type from Silverton, Colorado. No. 56,800 $ yg. ad., U. S. National 

 Museum, Biological Survey Collection. October 20, 1893. J. Alden 

 Loring. Original No. 1185. 



Characters. Similar to streatori but smaller; black tip of tail very much 

 shorter (projecting only 15 mm. beyond white hairs): Teeth about same 

 size as in streatori, but skull disproportionally smaller; frontals and 

 rostrum more depressed; bullae smaller and narrower. 



Winter pelage. White all over except short black tip of tail. White 

 without yellowish tinge. (Two males from Colorado the type from 

 Silverton, and another from Crested Butte collected February 17, 1902 

 by E. R. Warren). 



Summer pelage. Upperparts uniform drab brown (or between drab 

 brown and hazel, but lacking the reddish of hazel); end of tail black; 

 underparts white throughout with straight line of demarcation along 

 sides, the white reaching down on underside of legs to wrists and ankles; 

 rest of legs and feet brown like back; toes of forefeet white on upper 

 side; toes of hind feet mixed brown and white. (Young female from 

 Rocky Mountains of Alberta, Canada, near Henry House, July 21, 1896, 

 J. Alden Loring). 



Remarks. The animal is nearly as small as rixosus, from which it is 

 easily distinguished by the longer tail and black tip, and slightly larger 

 skull and teeth. 



