apodemus 793 



Skull romaining light and smooth, cvon in 

 extreme old age, the brain-case never 

 developing evident lateral ridges; size 

 medium or small, the hind foot most 

 frequently 22-23 mm. (20-25 mm.) ;* condy- 

 lobasal length of skull in individuals with 

 noticeably worn teeth most frequently 

 23-24 mm. (21-26 mm.).* 

 General form of skull slender, especially in 

 rostral portion ; mandible with coronoid 

 process reduced; colour dusky above, 

 dull white below, the pectoral spot obso- 

 lete ; size maximum for this section, the 

 hind foot and oondylobasal length of 

 skull sometimes exceeding 20 mm. (Fair 



Isle, Scotland) A. fridariensis, -p. 825. 



General form of skull normal, the coronoid 



process of mandible well developed ; 



colour reddish, yellowish or pallid above, 



underparts whitish or washed with 



brown, the pectoral spot usually well 



developed ; size moderate or small. 



Underparts always heavily washed with 



yellowish brown ; ear shortened and 



narrowed. 



Oondylobasal length of skull 24 to 25 mm. 



(Hebrides, Scotland) A. hebridcnsis, p. 824. 



Oondylobasal length of skull 25-6 to 



27 mm. (St. Kilda Island, Scotland) .4. hirtensis, p. 825. 

 Underparts usually whitish, occasionally 

 washed with yellowish brown ; ear 



.iiormal A. sylvaticus, p. 797. 



Size small, hind foot most frequently 



22 mm., coudylobasal length of skull 

 most frequently 23 mm. 



General colour above rich yellowish 

 brown usually with a decided 

 russet tinge (Europe north of 



Mediterranean region) A. s. sylvaticus, p. 803. 



. General colour above light yellowish 



brown without russet (Crete) A. s. creticus, p. 813. 



Size medium, hind foot most frequently 



23 mm., oondylobasal length of skull 

 most frequently 25 mm. 



General colour above rich yellowish 



brown usually with a decided 



russet tinge (Pyrenees, Asturias 



and Portugal) a.s. callipides, p. 809. 



General colour above pale yellowish 



or greyish brown without russet 



(Mediterranean region in general) A. s. dichrurus, p. 810. 



* These dimensions exceeded in the local form inhabiting Fair Isle, 

 Scotland. 



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