EVOTOMYS 645 



animal. The depth of the entire skull from occipital region to 

 anterior base of zygomata is relatively greater than in any of the 

 other European species except E. cdesarms. Postorbital processes 

 small but unusually prominent and well defined, a well developed 

 ridge extending obliquely backward and upward from each 

 process nearly to anterior edge of parietal. Rostrum and 

 incisive foramina normal. Zygomata rather abruptly flaring, 

 about as in _B. glareolus norvegicus. Auditory bullae relatively 

 larger than in the large forms of Evotomys glareolus. 



Teeth. — The teeth are essentially like those of Evotomys 

 glareolus nageri ; thii'd upper molar normally with three re- 

 entrant angles on inner side (see Table, p. 631). 



Measurements.- — Type (adult male): head and body, 108; 

 tail, 59; hind foot, 18; ear from meatus, 13. Average and 

 extremes of ten adults: head and body, 109 "7 (105-121); tail, 

 55-5 (50-61); hind foot, 18-4 (18-19); ear from meatus, 

 13*5 (13-14). For cranial measurements see Table, p. 656. 



Specimens examined. — Thirteen, all from Skomer Island (B.IM. and 

 U.S.N.M.). 



5 (5, 2 9. Skomer Island, S.W. Y. H. Mills (c & p). 3. 7. 4. 1-7. 

 Wales. (3. 7. 4. 3. Type of species.) 



1 al. Skomer Island. R. Drane (c & p). 4. 8. 5. 1. 



2. Skomer Island. E. Drane (c & p). 11. 1. 3. 265-266. 



EVOTOMYS CiESARIUS Miller. 



1896. Evotomys glareolus Barrett-Hamilton, The Zoologist, 3rd ser., xx, 



p. 98, March, 1896 (Jersey, Channel Islands). 

 1908. Evotomys cxsarius Miller, Ann. and Mag. Nat. Hist., 8th ser., i, 



p. 195, February, 1908. Type in British Museum. 

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



Tijpe locality. — St. Helier, Jersey, Channel Islands. 



Geographical distribution. — ^Known only from the island of 

 Jersey, Channel Islands. 



Diagnosis. — General size as in the other large European 

 forms, but tail distinctly less than half as long as head and body, 

 and ear unusually shortened ; colour dark and rather dull ; 

 essentially no line of demarcation on sides ; skull larger and 

 more massive than in any of the Continental members of the 

 genus, E. rufocanus not excepted. 



Colour. — Winter pelage : upper parts a rich, dark, reddish 

 brown, approaching the cinnamon-rufous of Ridgway, but not so 

 vivid, the sides of body and outer surface of fore leg lighter and 

 suffused with dull buff, though not sufficiently to produce any 

 marked contrast with back ; underj^arts a clear rich buff (between 

 the buff and cream-buff of Ridgway), the line of demarcation 

 along sides ill-defined ; tail sharply and conspicuously bicolor, 

 blackish above, concolor with belly below ; feet a dusky grey 

 above, rather dark brown on furred portion of sole. Summer 

 pelage : red area restricted to back, and noticeably browner and 



