EVOTOMYS 233 



8. Evotomys caesarius Miller. 



1896. Evolomys glareolus Barrett-Hamilton, The Zoologist, [3], 20, 



p. 98 (Jersey). 

 1908. Evolomys ccesarius IVIiller, Ann. Mag. N.H., [8], 1, p. 195; 



Trouessart, Faune Mamm. d'Europe, 1910, p. 169; Miller, Catal. 



Mamm. W. Europe., 1912, p. 645. 



Type.—BM., No. 3.2.11.2; adult male, skin and skull, 

 collected and presented by G. E. H. Barrett-Hamilton. 



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



Range.- — Known only from the island of Jersey, Channel 

 Islands. 



Characters. — General size as in the other large European 

 forms (hind-foot 18-20 mm. ; condylo-basal length of skull 

 25-27-4 mm.), but tail distinctly less than half the length of 

 head and body, and ear unusually short. Colour dark and 

 rather dull, with no noticeable line of demarcation upon flanks. 

 Skull very large and massive. 



In winter pelage upper parts a rich, dark, reddish-brown, 

 approaching the " cinnamon rufous " of Ridgway, but not so 

 vivid. Flanks and outer surfaces of fore-legs paler, suffused 

 with dull buff, though not sufficiently to produce any marked 

 contrast with back. Under parts a clear rich buff (between the 

 " buff' " and " cream-buff " of Ridgway). Flank line of demarca- 

 tion ill defined. Tail sharply bicoloured, blackish above, clear 

 buff below. Feet dusky grey above, rather dark brown on furred 

 portion of soles. 



In summer pelage : red area restricted to back, and noticeably 

 browner and duller than in winter, the exact shade nearly " hazel." 

 Flanks broccoli-brown, in rather strong contrast with back, but 

 fading insensibly into the dull buff of under surface. Tail and 

 feet as in winter. 



Skull larger than that of any other member of the nageri 

 group (with the possible exception of E. n. hallucalis). It differs 

 from that of other species in its greater dejDth, more convex dorsal 

 profile, and especially in the greater angle at which the nasals are 

 bent downwards. In the last character it is approached by 

 E. skomeroisis, but the dorsal surface of the braincase is not 

 flattened as in the Skomer Vole. Interorbital region wide, not 

 tending to assume a cylindrical form as in E. rufocaniis, the lateral 

 ridges noticeable in old age, but remaining widely separated by 

 a broad median groove. Braincase relatively short and broad, 

 but less ridged and angular than in E. skoniereiisis. Post-orbital 

 processes of squamosals rather large, but less Microtus-Vike than 

 in E. ntfocanus and with no trace of a ridge extending obliquely 

 backwards towards the parietal such as occurs in E. skomereiisis. 

 Nasals about as long as the diastema, moderately spatulate in 

 outline. Rostrum more robust than in other European species ; 

 incisive foramina normal. Zygomatic arches not very abruptly 



V.L. R 



