FIELD BOOK OF MAMMALS 



Unalaska Meadow Mouse. — Microtus unalascensis unalas- 



censis Merriam. 

 Larger and heavier than operarius ; underparts white ; upper- 

 parts dull yellowish brown, darkened on head and rump; 

 tip of nose whitish; feet gray; tail bicolor, blackish and 

 soiled white; underparts white to soiled whitish. Total 

 length, 7.2 inches; tail vertebrae, 1.5 inches; hind foot, .88 

 inch. Found only on Island of Unalaska, Alaska. 



Popof Island Meadow Mouse. — Microtus unalascensis popof- 

 e7isis Merriam. 

 Resembling typical unalascensis but with no white on nose. 

 Upperparts and underparts as in typical unalascensis except 

 that nose is dusky to tip. Total length, 7.5 inches; tail 

 vertebras, 1.7 inches; hind foot, .88 inch. Found only on 

 Popof Island. Alaska. 



Sitka Meadow Mouse. — Microtus sitkensis Merriam. 



Size of unalascensis which it somewhat resembles in color. 

 Upperparts (summer) rusty brown, sprinkled with blackish, 

 brownest on nose and rump; sides with less black; nose 

 blackish; feet grayish; tail bicolor, black and pale buff; 

 underparts dark buff. Total length, 7.6 inches; tail 

 vertebras, 1.8 inches; hind foot, .92 inch. Found only on 

 Baranof Island, Alaska. 



Innuit Meadow Mouse. — Microtus innuitiis Merriam. 



Size large; tail sharply bicolor. Known only from im- 

 perfect specimens from owl pellets and hence most of ex- 

 ternal characters are unknown. Tail vertebrae, 1.6 inches; 

 hind foot, .92 inch. Found only on St. Lawrence Island, 

 Bering Sea, Alaska. 



Montague Island Meadow Mouse. — Microtus elymocetes Os- 

 good. 

 Size ' large for the operarius group ; resembling typical 

 operarius in color but slightly darker, with underparts 

 heavily washed with buffy. Upperparts raw umber in 

 tone, mixed cinnamon and dusky; forefeet dusky brown; 

 hind feet grayish white on toes, dusky brown on "ankles"; 

 tail sharply bicolor, dusky brownish above, whitish gray 

 below. Total length, 8 inches; tail vertebrae, 1.6 inches; 

 hind foot, .9 inch. Found only on Montague Island, 

 Prince William Sound, Alaska. 



Abbreviatus Group 



Hall Island Meadow Mouse. — Microtus abbreviatus abbrevia- 

 tus Miller. 

 Size large; tail very short; feet large and strong; ears 

 hidden in long fur. Upperparts (summer) dark buff; feet 

 dirty white; tail bicolor, dark brownish and creamy; under- 

 parts creamy white to pale buff. Total length, 6.4 inches; 

 tail vertebrae, i.o inches; hind foot, .93 inch. Found only 

 on Hall Island, Bering Sea, Alaska, 



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