658 RODBNTIA 



than in E. glareolus, so that main axis of loop appears to curve 

 inward instead of outward. Roots of molars developing later 

 in life than in the other European species, the position of the 

 inner extremity of upper teeth indicated by an evident capsule. 

 Basal portion of m s usually well outlined on inner surface of 

 mandible. 



Measurements. — External measurements of adult male from 

 Lappmark, Sweden: head and body, 114; tail, 37; hind foot 

 (dry), 18 • 4. Adult from Kvickjock, Sweden (well-made skin): 

 head and body, 110; tail, 40; hind foot, 18. For cranial 

 measurements see Table, p. 657. 



Specimens examined. — Twenty-four, from the following localities : — 

 Norway: Varangerfjord, 1; Sudvaranger, 1 (U.S.N.M.); Stabursnaes, 

 Porsanger, 2 (B.M. and U.S.N.M.) ; Kishand, Porsanger, 1 ; Porsanger, 1 

 (U.S.N.M.) ; Molmen, Kristiansamt, 1 ; Sundal Fjeld, 1 ; Hyllingen, 

 Trondhjem, 1; Tanen, Finnmarken, 2 (U.S.N.M.). 



Sweden : Karesuando, Norbotten, 3 (B.M. and U.S.N.M.) ; Lappmark 

 (no exact locality), 1; Tornea, Lappmark, 2 (U.S.N.M.); Kvickjock, Nor- 

 botten, 6 (B.M. and U.S.N.M) ; no exact locality, 1. 



Remarks. — Evotomys rufocanus is so readily distinguishable 

 from the other European members of the genus as to require no 

 special comparison. So different is the animal from the better 

 known species that it has been made the type of a special sub- 

 genus Craseomys. The discovery of additional species, notably 

 Evotomys csesarius, intermediate in character between true 

 Evotomys and Craseomys, and the fuller comprehension of the 

 dental peculiarities of Evotomys rutilus, make such a division of 

 the genus Evotomys appear to be no longer warranted. 



1 skull. Varangerfjord, Finmark, Dr. B. Collett (p). 84. 10. 81. 4-5. 

 Norway. 



6. Stabursnaes, Porsanger. Dr. R. Collett (p). 84. 10. 31. 7. 



6 skull. Kishand, Porsanger. Dr. B. Collett (p). 84. 10. 31. 6. 



5. Molmen, Kristiansamt. B. J. Cuninghame 98. 5. 2. 5. 



(c & p). 

 Sundal Fjeld. E. Lort Phillips 94. 10. 22. 2. 



(c& p). 

 ?. Hyllingen, Trondhjem. G. Barrett-Hamilton 11. 1. 2. 114. 



i. Karesuando, Norbotten, Stockholm Museum 90. 8. 1. 15. 



Sweden. (e). 



1. Kvickjock, Norbotten. Prof. Sundevall (p). 49. 11. 1. 11. 



6. Lappmark. (G. Kolthoff.) Lord Lilford (p). 11. 1. 1. 153. 

 1. Sweden. Stockholm Museum 46. 6. 2. 70. 



(■)■ 



Genus MICROTUS Schrank. 



(Synonymy under sub-genera.) 



Geographical distribution. — Northern portions of northern 

 hemisphere south in America to southern Mexico and in Europe 

 to the Mediterranean coast. 



