1900.] 



HUS SILVATICrS AND ITS ALLIES. 



423 



Mus sylvaticus intermedins. 

 Great Britain : 



No. of items 



f Maximum , 



<3 s. \ Mean 



Minimum , 



No. of items 



Head 



and 



body. 



62 



mm. 



Ill 



92-6 



83 



31 

 mm. 

 110 



92 



78 



Tail. 



61 

 mm. 

 103 



88-2 

 67 



31 

 mm. 



98 



84-5 



70 



Hind 

 foot. 



60 

 mm. 

 245 

 22-7 

 20 



30 



mm. 



24 



22-5 



20 



Ear. 



26 ^ 

 mm. 

 17-5 

 15-4 

 14 



{Maximum 

 Mean 

 Minimum 



Percentage of specimens in which length of head and body 



exceeds that of tail 



Percentage of specimens in which length of tail equals or is 



less than head and body 



Percentage of specimens in which length of head and body 



exceeds 90 mm 



Percentage of specimens in which length of head and body 



exceeds 100 mm 



Percentage of specimens in which length of feet reaches 24 mm. 

 Percentage of specimens in which length of feet does not reach 



24 mm 



*lmmature Specimens. 



<5. Lowestoft, Suffolk, Aug. 25, 1894, 



Oldfield Thomas. 

 <3 . Rugby, Warwickshire, Jan. 2, 1894, 



A. S. Austen. 

 <$ . Lyndhurst Road, New Forest, Hants, 



July 12, 1894, Col. J. W. Yerbury. 

 5 . Chiswick, near London, Aug. 31 , 1897, 



Miss D. Sharpe. 

 5 (nursing). Hurlingham, near London, 



Aug. 31, 1897, R. I. Pocock. 

 $. Cheadle, Staffs., Nov. 13, 1897, 



E. W. H. Blagg. 

 5 . Dunphail, Elginshire, Scotland, Sept. 



19, 1893, W. R. Ogilvie Grant. 



Head 

 and 



body, 

 mm. 

 85 



78 



81 



83 



90 



64 



57 



Tail. 



mm. 

 79 



85 



83 



90 



71-5 



74 



57 



Hind 

 foot. 



mm. 

 23 



21 



22 



20 



20 



20 



19 



30 

 63 



13 



7 



93 

 Ear. 



17 



Ireland 

 5 



(S s, 2 £ s. Ballaghmoon, Car-~] 

 low, Jan. 20 to Mar. 6, 1896, | Max. 

 J. G. Symes (e coll. Barrett- )- Mean 

 Hamilton). Measured by | Min. 

 P. Metcalfe. J 



Skull, 



extreme 



length. 



12 

 mm. 

 17-5 ! 

 16 

 14 



tfs. 

 70 



25 to 26 

 mm. 



74 

 26 

 67 



23 



3 



97 



Skull, 



extreme 



length. 



mm. 



23 



25 



25 



24 



23 



223 



20 



* The length of foot, apart from the coloration, distinguishes these from Mus musculus, 

 of which I take at random the following dimensions for comparison, viz. : — 



6 



Head and 



body. 



83 



79 



Tail. 



78 

 72 



Hind 



foot, 



17 



16 



