536 MURIDAZE—APODEMUS 
smaller size, the average (although large ones occur) being not greater 
than in s. sy/vaticus ; in its greater zygomatic and inter-orbital widths, 
broader and deeper brain-case, and larger bullz, it makes a still nearer 
approach to %. hebrzdenszs than does the Jura form. 
(5) A. hebridensis fiolagan, Hinton. 
1914. APODEMUS HEBRIDENSIS FIOLAGAN, Hinton, Amm. and Mag. Nat. Hist., July 
1914, 1313 described from the island of Arran, Inner Hebrides ; type specimen, 
a male, No. 15.5.29.16 of the British Museum collection. 
1913. APODEMUS SYLVATICUS SYLVATICUS, G. E. H. Barrett-Hamilton and M. A. C. 
Hinton, Proc. Zool. Soc., London, 1913, 835. 
Celtic name :—(Local; in Arran)—/olagan (Alston). 
Distribution :—The island of Arran, Inner Hebrides. 
Description :—This is a large mouse approaching %. hebridensis in 
size, in which the feet and tail are rather shorter, and the ears no larger 
than in the typical form. In colour the back is rather rufous, though 
considerably darker than in cumbre; the ventral surface is (in the 
typical series of eight from Brodick, Arran) silver, darkened slightly by 
the bases of the hairs, with hardly a trace of the pectoral spot ; the line of 
demarcation is clearly defined. Ina female from the cliffs near King’s 
Caves, Arran, there is a bright pectoral spot which is continued back- 
wards as a median wash of yellow. The skull is a little smaller than 
in h. hebridensis, though larger than in cumbre ; its chief peculiarity is 
the unusual lengthening of the pterygoid region, the post-molar length 
being long, as in the skulls from Tiree and Jura, while the bulle are 
relatively smaller than in any other sub-species of hebridensis ; it 
differs from 4, hebridensis further in the slightly wider nasals, slightly 
greater palatal length, shorter diastemata, smaller incisive foramina, 
broader masseteric plates, and longer molar series. The differences 
noted appear to be correlated with the greater muscular needs of a 
rather more powerful dentition. 
DIMENSIONS IN MILLIMETRES :— 





Tail Hind foot 
Biss and | (without | (without Ear. 
we hairs). claws). 
A. hebridensis hebridensis. 
Lewis, U1a—Collected by W. E. de Win- 
ton :— 
1. Male (the type), 8th Aug. 1894 . 5 106 96 25 16 
2. Do. 28th Aug. 1894 ° ° . 112 100 25 16 
3. Female, 29th Aug. 1894. 108 95 23°5 15 
Maximum and minimum of 7 (3 males, 
4 females) immature or adolescent . 96 82 24 18°5 
Aug. and Sept. 1894 . : 85 77 23°5 14°5 
GARRYNAHINE, CALLERNISH, W. Lrwis— 
Collected by D. Anderson, 5th to 10th 
April 1918; average of (pnt 90°43 85'S 23 148 
Maximum (male) < 5 Fy 5 5 98 95 24 14°5(15) 



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