Proceedings of the Biological Society of Washington. 
Marmota caligata sheldoni* snbsp. nov. 
MONTAGUE ISLAND MARMOT. 
Type from Montague Island, Alaska. Adult male, No. ]37,319, U. S. 
National Museum (Biological Survey Collection); May 24, 1905, Charle.s 
Sheldon; original numher, 12. (5461, N catalogue.) 
Characters . — Similar to caligata, but size smaller; .skull with shorter 
nasals and narrower premaxilke. 
Measurements. Adult male topotype; Total length, 670; tail vertebrae, 
185; hind foot, 94 ; adult female topotype: 640; 180; 90. Skull . — Adult 
male (type): Condylo-hasal length, 89.5; zygomatic breadth, 61.5; 
breadth of rostrum, 20.5. 
i?e?aarA’s.—This race is confined to Montague Island and differs from 
the mainland form in size only. 
* Named for Mr. Charles Sheldon, in recognition of his valuable contri^itio^nTto 
onr knowledge of Alaska mammals. 
