EXPLANATION OF PLATE III. 



FIG. 1. Evolomys rutilus (Pallas). 



ad., Syd Varanger, Finmark, Norway, No. 6555, Merriam Coll. 



1, top of skull; la, palate region. 



2. Evotomys daivsoni Merriam. 



cJ ad., Yakutat, Alaska, No. 73586, U. S. Nat. Mus., Biological 

 Survey Coll. 



2, top of skull; 2a, palate region. 



3. Evotomys loringi subsp. nov. 



cT ad. (type), Portland, Traill Co., N. Dakota, No. 75795, U. S. 

 Nat. Mus., Biological Survey Coll. 



3, top of skull. 



4. Evotomys nivarius sp. nov. 



9 ad. (type), Mt. Ellinor, Olympic Mts., Washington, No. 

 66203, U. S. Nat. Mus., Biological Survey Coll. 



4, top of skull. 



5. Evotomys wrangeli sp. nov. 



5. 9 ad. (type), Wrangel Island, Alaska, No. 74724, U. S. 

 Nat. Mus., Biological Survey Coll. (5, same locality ; No. 

 74730.) 



5, top of skull ; 5, palate region. 



6. Evotomys mazama Merriam. 



6. tf ad. (type), Crater Lake, Oregon, No. 79913, U. S. Nat. Mus., 

 Biological Survey Coll. (Ga ^, same locality ; No. 79915.) 



6, top of skull ; 6, palate region. 



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