422 MURIDA—EVOTOMYS 
25 to 26-2 mm.), and has a narrow dark mantle moderately in contrast 
with the dull greyish flanks. #. x. hallucalis (Thomas), of the 
Aspromonte Mountains and Monte Pellino, southern Italy (Basilicata 
and Calabria), is a well-marked form, closely resembling Z. x. nageri 
externally, but with a longer, narrower brain-case, shorter rostrum, 
short wide incisive foramina, and larger teeth. Miller’s 2. cesarius 
(Ann. and Mag. Nat. Hist., February 1908, 194), first taken by me at 
St Helier, Jersey, has rich dark colour, short tail and ears, and very 
large and massive skull; the head and body averages 111, tail 51, 
hind foot 19-3, ear 11-4, and condylo-basal length of skull 25 to 27-4. 
Origin:—There can be no doubt that the Skomer Mouse is the 
descendant of ancestors formerly inhabiting a region extending at least 
from Raasay Island, Scotland, to Skomer Island and Jersey. As stated 
above, they have been driven out by g/areolus, and isolation has pro- 
duced local differentiation, so that there are now four known forms, of 
which skomerensts and c@sarius are more distinct than the representa- 
tives of the same stock inhabiting the mountainous regions of western 
Europe. The recent discovery of the Scottish members of the group 
remarkably fulfils Stejneger’s prophecy (Smiths. Mzsc. Coll, 4th May 
1907, 478) that he “would not be surprised if they also were to be 
found in the northern highland of Scotland.” 
Very little is known about the habits of this mouse. Mr Robert 
Drane always took it about or inside farm buildings, and Dr Y. H. 
Mills in the heaps of swedes in which it was feeding. Mr Drane kept 
five alive, and these soon became tame, and increased to forty-seven 
between June and October. He mentions a litter of five. 
ALSTON’S BANK MOUSE. 
EVOTOMYS ALSTON/, Barrett-Hamilton and Hinton. 
1913. EVOTOMYS ALSTONI, G. E. H. Barrett-Hamilton and M. A. C. Hinton, Aédstract 
Proc. Zool. Soc. (London), No. 119, 15th April 1913, 18; and Proc. Soc. cit., 
1913, 827; described from Mull, Scotland (type specimen No. 14.1.30.4 of British 
Museum collection). 
Distribution:—This mouse is at present known only from the 
Island of Mull, Scotland, where five specimens were taken by k. W. 
Sheppard in June 1912, during a trip managed by Ogilvie-Grant and 
financed by many subscribers.t 
1 This first attempt at systematic examination of the mammals of the western 
islands of Scotland, carried on, in spite of many difficulties, under the superin- 
tendence of Ogilvie-Grant, by R. W. Sheppard in 1912, and by D. Anderson, 
P. D. Montague, and C. H. B, Grant in 1913, resulted in the discovery of one new 
species of Shrew (Sovex grantiz), two new species of Evotomys (4. a@/stoni and 
erica); and three new sub-species of the Northern Grass-Mouse, /icrotus agrestis 
