378 MURIDA 
II. Size smaller (“mice,” with head and body not 
exceeding 130, hind foot rarely reaching 27 
mm.) :— 
: MUSCARDINUS 
1. Tail bushy, colour brownish-yellow . Hh aiellane 
2. Tail scaly or sparsely haired, not bushy :— 
(A) Tail distinctly less than half as plone *8\ MICROTUS. 
head and body 
(a) Size smaller (head and body arene) 
100, hind foot 16-18 mm.), colour ;JZ. hirtus. 
brighter (back in extreme cases rufous)) 
(s) Size larger (head and body rro-r25, 
hind foot 18-20 mm. :— 
(a’) Colour brownish . F . MW. agrestis. 
(a) Upper parts with decided ea a. neglectus 
of russet (Scottish Highlands). 
(b) Upper parts without tinge of 
TussSet;— 
(a’) Under parts washed 
with wood brown (the 
hair-bases concealed); 
coat thick (hairs of 
las . a. exsud 
(Hebrides). 
back 13 mm. ‘ 
(b’) Under parts dusky (the 
slaty hair-bases 2g 
part in the general 
coloration) ; coat in| 
(hairs of back 8 mm ) 
(z') Colour above rich brown, beneath\ JZ. orcadensis (South 
but : E Orkney Islands). 
M. a. macgillivratt 
(Islay). 
(c’) Colour above greyish-brown, 
be-) ; 
neath buffy-grey 4] M. sandayensts. 
(a) Colour paler, back ee “hair| AL s. sandayensts (San- 
brown” .J day Island, Orkneys). 
(b) Colour darker, back dark “hair\ JZ s. westre (Westray 
brown” é , Island, Orkneys). 
(B) Tail about half as long as head and body EVOTOMYS. 
(A) Size smaller (head and body go0-100,) 
hind foot 15°4-r7 mm.), colour deeper pe glareolus britannicus. 
(B) Size larger (head and body t1oo-r10,\Z. skomerensis (Skomer 
hind foot 18-19 mm.), colour brighter . Island). 
(c) Size as in skomerensis, 
colour as in) ’ 
glareolus } N23 alstont (Mull). 
