646 



RODENTIA 



duller than in winter, the exact shade nearly hazel ; sides bioccoli- 

 brown, in rather strong contrast with back, but fading insensibly 

 into the dull buft" of underparts. Tail and feet as in winter. 



Shidl. — The skull is larger than that of any of the other 

 European Evotomys* In form it differs from the others in its 

 greater depth, more convex dorsal profile, and especially in the 

 greater angle at which the nasals are bent downward. In the 

 last character it is approached by E. sJcomerensis ; but the dorsal 

 surface of brain-case is not flattened as in the Skomer vole. 

 Interorbital region wide, not tending to assume a cylindrical 

 form as in E. rufocanits, the lateral ridges noticeable in old age 

 but remaining wide apart, with a broad trough-like median 

 groove. Brain-case relatively shorter and broader than in the 

 Continental species, but less ridged and angular than in 

 E. sJcomerensis. Postorbital processes rather large, but less 

 Microtus-like than in E. rufocanus and with no trace of a ridge 

 extending obliquely backward toward parietal such as occurs in 

 E. sJcomerensis. Nasals about as long as diastema, moderately 

 spatulate in outline. Rostrum more robust than in any of the 

 other European species ; incisive foramina normal. Auditory bullae 

 large, not peculiar in form. Zygomata not very abruptly spread- 

 ing, the median portion of the two arches parallel. 



Teetli. — Except for their larger size the teeth are essentially 

 as in Emtomys glareolus. Third upper molar with third inner 

 re-entrant angle normally present (see Table, p. 631). Anterior 

 loop of wij very short. 



Measurements. — External measurements of type (not fully 

 adult male) : head and body, 96; tail, 49; hind foot, 18 ; ear 

 from meatus, 1 1 . Average and extremes of ten adults : head 

 and body, 111-5 (107-115); tail, 50-9 (48-58) ; hind foot, 19-3 

 (18-5-20); ear from meatus, 11-4 (11-12). For cranial 

 measurements see Table, p. 657. 



Specimens examined. — Eighteen, all from the island of Jersey. 



2 6. St. Helier, Jersey. G. Barrett-Hamilton 3. 2. 11. 1-2. 



(c & p). (3. 2. 11. 2. Typeoi species.) 



5 (5, 2 ?. Trinity, Jersey. O. Thomas (p). 8. 9. 2. 12-17. 



[R. H. Bunting.) 



EVOTOMYS RUTILUS Pallas. 



1778. M'us rutilus Pallas, Nov. Spec. Quadr. Glir. Ord., p. 246. 



1874. Evotomys rutilus Goues, Proc. Acad. Nat. Sci., Philadelphia, p. 187. 



1900. Evotomys rutilus Miller, Proc. Washington Acad. Sci., n, p. 91, 



July 26, 1900. 

 1910. Evotomys rtdihis Trouessart, Faune Mamm. d'Europe, p. 169. 



Ty^pe locality. — Siberia east of the Obi. 



GeofjrajjJiical distribution. — Arctic Asia and Europe, south in 

 Norway to Tromso, and in Sweden to Norbotten. 



* With the possible exception of E. glareolus hallucalis, adults of which 

 have not been examined. 



