544 MURIDAZ—APODEMUS 
(2) Apodemus fridariensis grantid (Hinton). 
1914. APODEMUS FRIDARIENSIS GRANTII, M. A. C. Hinton, Amn. and Mag. Nat. 
fTist., July 1914, 132 ; type an old male, No. 15.5.31.4 of British Museum collec- 
tion; described from the island of Yell, Shetland. 
Local name :—//7// Mouse. 
Distribution :—Yell, and possibly Mainland, Shetland. 
Description :—This sub-species is distinguished from typical A. 
Jridariensts by its slightly smaller size and relatively shorter tail. In 
colour it is quite like the typical form, save that a small pectoral spot 
appears to be constantly present, and the contrast between the upper 
and lower surfaces of the tail is much less striking. The line of 
demarcation on each flank is very regular and distinct. 
The skull is slightly smaller than in the Fair Isle form. The 
brain-case is shorter and rounder, more like that of sy/vaticus in form ; 
the nasals slope more gently forwards, and the dorsal profile appears to 
be flatter and less convex throughout. The masseteric plates of the 
zygomata are much narrower and do not project so far in advance of the 
bridges over the infra-orbital canals. The bullae are smaller. In the 
mandible the coronoid processes are even more slender; the angular 
processes are exceptionally long, and specimens may be readily dis- 
tinguished by this character from the mandibule of all other European 
forms of Apodemus. For external and cranial dimensions, see tables 
below and at p. 538 respectively. 
DIMENSIONS IN MILLIMETRES :— 








Tail Hind foot Weight 
Head endl (without (without Ear. in 
y: hairs). claws). grammes. 
Fair Isix.—A. fridariensts fridariensis :— 
1. Male (N. B. Kinnear), paratype, 
5th Sept. 1905 115 106 23 15 35 
2° Do. do. 9th Sept. 1906 113 102 24 17 “i 
3) Do: do. 16th May 1906 106 a 24 16 
4. Do. (Duchess of Bedford), 
10th Oct. 1910 107 105 25 16 
5. Female (N. B. Kinnear), 
14th Sept. 1906 111 6 24 17 
6. Do. (Duchess of Bedford), 
10th Oct. 1910 105 100 25 16 
ie DO: do. 10th Oct. 1910 99 95 25 16 
YELL, SHETLAND.—A. f. grantit :— 
1. Male (W. R. Ogilvie-Grant), 
22nd June 1913 104 91 23 16°5 
PE “idle do. 22nd June 1913 100°5 87 23 16°5 
Gh 10Yes do. 25th June 1918 98 79 24 15°5 ae 
4. Do. do. 25th June 1913 105 80 25 15°5 (Type) 
6. Do. do. 22nd June 1914 99 96 24°5 16 ne 
6. Do. do, 25th June 1914 110 94 25 7 
(5 10% do. 25th June 1914 106 92 24 16 
8. Do. do. 25th June 1914 102 100°5 24 ° 17°5 
9. Female, do. 22nd June 1918 97 96 23 15°5 
10. Do. do. 22nd June 1914 94 92 24 15°75 
Average of 6 adults of A. f. fridariensis . 109°5 103°2 24-1 16-1 
Average of 10 adults of 4. f. grantti . : 101°5 91°75 23°95 16°17 

ee Be a a 
