534 MURIDA—APODEMUS 
island (p. 438), these mice have unusually long thick fur; the back is 
dark ; there is a pectoral spot and median wash of buff below—features 
which are better developed in the male than in the female. The skulls 
show greater palatal length, a wider masseteric plate, and longer molars 
than in %. hebrzdenszs ; but since the teeth are only slightly worn these 
differences may be due to immaturity. The status of this animal 
cannot be determined without further material. 
(2) A. hebridensis hamiltont, Hinton. 
1914. APODEMUS HEBRIDENSIS HAMILTON], M. A. C. Hinton, An. and Mag. Nat. 
Hitst., July 1914, 126; described from Rum, Inner Hebrides; type specimen, 
a male, No. 15.5.28.22 of the British Museum collection. 
Distribution :—Confined to the island of Rum. 
Description :—This field mouse agrees in general size and propor- 
tions with the largest specimens of A. %. hebridensis, but has a still 
larger and a more massive skull. Colour:—The backs are about as 
in hebridensis ; the ventral surface is silvery, darkened by the hair- 
bases, with an evident though not very bright pectoral spot, and some 
slight trace of a yellowish wash; the line of demarcation is a little 
irregular, and moderately defined. The skullis distinguished from that 
of h. hebridensis by its greater size, general narrowness (the nasals, 
however, being as broad as in the Stornoway series), and greater 
palatal length. The shoulders of the brain-case are rather strongly 
ridged in a manner recalling the skull of A. flavicollis wintonz, from 
which, however, it is readily distinguished by its much smaller bulle, 
greater palatal length, and longer incisive foramina. 
For external and cranial dimensions, see tables at pp. 537 and 538 
respectively. 
(3) A. hebridensis cumbre, Hinton. 
1914. APODEMUS HEBRIDENSIS CUMBR&, M. A. C. Hinton, Aum. and Mag. Nat. 
Hist, July 1914, 128; described from Great Cumbrae, Inner Hebrides; type 
specimen, a female, No. 15.5.29.26 of British Museum collection. 
1913. APODEMUS SYLVATICUS SYLVATICUS, G. E. H. Barrett-Hamilton and M. A. C. 
Hinton, Proc. Zool. Soc., London, 1913, 835 (in part). 
Distribution :—The island of Great Cumbrae, Inner Hebrides. 
Description :—This mouse is smaller than typical edridenszs, in size 
about as s. sy/vaticus ; the tail and ears are relatively longer, the feet 
relatively as large as in 2. hebridensi’s. Colour of back rufous, with very 
few black hairs; the belly is silver, with hardly a trace of the pectoral 
spot ; the line of demarcation is clear, but owing to the light colour of 
the flanks, the contrast is not very striking. The skull is scarcely 
larger than in s. sylvaticus, but it agrees in all essential respects with 
that of hedridensis ; it differs from %. hebridenszs in having the inter- 
