170 



THIS ZOOLOGIST. 



a distinctly stouter build, which is very striking in animals in the 

 flesh, but which simple length-measurements cannot convey. In 

 old specimens the colour of the under parts is generally dusky or 

 sandy, with no distinct line between the upper and under parts, 

 and I have never seen a specimen with a typical sylvaticus belly ; 

 the tail is almost uniformly brownish grey, and shorter and 

 thicker in proportion. 



The following table, taken from a few specimens of my own 

 collecting, will show how Mus hebridensis compares in measure- 

 ments with its nearest allies M. sylvaticus and M, flavicollis ; that 

 in size it about equals the latter, while the hind feet are larger, 

 but the ears do not equal the dimensions of those of the much 

 smaller M, sylvaticus. 



Adults, with worn teeth. 



Young, still in the grey pelage. 



All measurements are in millimetres. The length of the tail 

 does not include the terminal hairs, and that of the hind foot 

 does not include the claws ; the ear is measured on the inside 

 from the notch ; the measurement of the head and body and tail 

 may be relied on as giving the total length of the animal in the 

 flesh. 





M. 



HEBRIDENSIS. 



M. FLAVICOLLIS. 



M. 



SYLVATICUS. 



Sex, ad. 



$ 



$ 3 ? 



? ? <? $ 



S 



s 



? <? 



Head and Body . 



106 



106 112 108 



108 110 110 115 



93 



92 



92 97 



Tail 



96 



99 100 95 



108 115 112 112 



86 



82 



78 85 



Hind-foot . . . 



25 



25 25 23± 



24 23 24 24 



22 



22 



22 23 



Ear 



16 



16 16 15 



18 18 18 18 



17 



16 



17 17 



Sex, juv. 



? 



* # <r 



? ? <? <? 



<? 



<? 



? 9 



Head and Body . 



96 



92 94 94 



81 84 68 90 



83 



83 



71 78 



Tail 



82 



81 86 83 



84 83 60 93 



75 



79 



59 70 



Hind- foot . . . 



24 



24 23£ 25 



21 22 20 24 



22 



21* 20 21 



Ear 



13£ 15 15 15 



16 16 16 17 



16 



16 



16 16 



This, following so soon upon my article in * The Zoologist' 

 of December, 1894, recording Mus flavicollis, Melchior, as a 



