648 RODENTIA 



Bemarhs. — Externally Evotomys rutilus is distinguishable from 

 the other European members of the genus by its short, abun- 

 dantly-haired tail, and by the bright colour of its dorsal area. 

 The weak molar rows and the peculiarities of the third upper 

 molar are also diagnostic. Notwithstanding the weakness of the 

 teeth the pattern of the enamel folding is characterized by 

 unusually definite angularity and general firmness of line. 



1. Tornea, Lapland. Prof. Sundevall (p). 45. 10. 25. 9. 



2. Lapland. Prof. Sundevall (p). 49. 11. 1. 7-8. 

 skull. Varanger Fjord, Fin- Dr. R. Collett (p). 84. 10. 31. 5. 



mark. 



EVOTOMYS RUFOCANUS Sundevall. 



1846. Hyimdfeus rufocanus Sundevall, Ofversigt af Kongl. Vetensk. Akad. 



Forhandl., iii, p. 122. 

 1897. Evotomys rufocamis Bailey, Proc. Biol. Soc, Washington, xi, p. 122, 



May 13, 1897. 

 1900. Evotomys mfocanns Miller, Proc. Washington Acad. Sci., ii, p. 89, 



July 26, 1900. 

 1910. Evotomys (Craseomys) rufocamis Trouessart, Faune Mamm. d'Europe, 



p. 173. 



Type locality. — Lappmark, Sweden. 



Geographical distribution. — Northern Europe, south in the 

 mountains of Norway to Dovre, east into Asia. 



Diagnosis. — Form essentially as in Evotomys glareolus, neither 

 tail nor ear shortened ; size large, as in E. csesarius (hind foot, 

 18 to 19, condylobasal length of skull, 26-6 to 27*6 mm.) ; skull 

 and teeth heavy, the upper molars with salient angles more 

 pointed than in the other European members of the genus, 

 E. rutilus excepted ; m^ normally with only two re-entrant angles 

 on inner side ; dorsal stripe narrow, conspicuously contrasted 

 with grey of sides. 



Colour. — Dorsal stripe well defined, narrow, extending from 

 between eyes nearly to base of tail. Its colour is dark but 

 rather bright, usually intermediate between hazel and cinnamon- 

 rufous, inconspicuously sprinkled with black-tipped hairs. Sides 

 a clear light grey formed by an intimate blending of hair-brown, 

 whitish, black, and slate-colour. Whole underparts soiled buffy 

 white, irregularly dulled by the slate-grey under colour. Cheeks 

 and muzzle similar to sides but slightly darker. Ear like dorsal 

 stripe. Feet dirty white. Tail sharply bicolor, brownish 

 above, dirty white below. In immature specimens the colour is 

 dull, the dorsal stripe bister scarcely tinged with red, the sides 

 less conspicuously grey. 



Skull. — The skull exceeds in size and massiveness that of any 

 of the forms of Evotomys glareolus, in this respect essentially 

 agreeing with that of E. csesarius. Interorbital region narrower 

 and more cylindrical than in any of the related species, zygomata 

 heavier and more abruptly and conspicuously expanded in front 



