18 Proceedings of the Biological Society of Washington. 

 Marmota caligata sheldoni* subsp. nov. 



MONTAGUE ISLAND MARMOT. 



Type from Montague Island, Alaska. Adult male, No. 137,319, U. S. 

 National Museum (Biological Survey Collection); May 24, 1905, Ciiarles 

 Sheldon; original number, 12. (5461, X catalogue.) 



Characters. — Similar to caligata, but size smaller; skull with shorter 

 nasals and narrower premaxillie. 



Measurements. — Adult male topotype : Total length, 670; tail vertebrae, 

 185; hind foot, 94; adult female topotype : 640; 180; 90. Skull.— Adnh 

 male (type): Condylo-basal length, 89.5; zygomatic breadth, 61.6; 

 breadth of rostrum, 20.5. 



Remarks. — This race is confined to Montague Island and differs from 

 the mainland form in size only. 



'Named tor Mr. Charles Sheldon, in recognition of his valuable contributions to 

 our knowledge of Alaska mammals. 



