1900.] 



MTJS SILVATICUS AND ITS ALLIES. 



423 



Mus sylvaticus intermedins. 



Great Britain : Head „. ■, 



and Tail. , " Ear. 



, ■, root, 



body. 



No. of items 62 61 60 26 "| 



mm. mm. mm. mm. I 



f Maximum Ill 103 245 17"5 | 



c?b. \ Mean 92-6 88"2 227 154 



I Minimum 83 67 20 14 



No. of items 31 31 30 12 



mm. mm. mm. mm. 



fMaximum 110 98 24 175 



$s. j Mean 92 845 22-5 16 



[Minimum 78 70 20 14 ) 



Percentage of specimens in which length of head and body cJs. 



exceeds that of tail 70 



Percentage of specimens in which length of tail equals or is 



less than head and body 30 



Percentage of specimens in which length of head and body 



exceeds 90 mm 63 



Percentage of specimens in which length of head and body 



exceeds 100 mm 13 



Percentage of specimens in which length of feet reaches 24 mm. 7 



Percentage of specimens in which length of feet does not reach 



24 mm 93 



Head „. , 



* Immature Specimens. and Tail. ,. . Ear. 



body. 



mm. mm. mm. mm. 



J. Lowestoft, Suffolk, Aug. 25, 1894, 85 79 23 



Oldfield Thomas, 

 cf. Eugby, Warwickshire, Jan. 2, 1894, 78 85 21 



A. S. Austen, 

 cf. Lyndhurst Road, New Forest, Hants, 81 83 22 



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

 $. Chiswick, near London, Aug. 31, 1897, 83 90 20 17 



Miss L\ Sharpe. 

 5 (nursing). Hurling ham, near London, 90 71 '5 20 



Aug. 31, 1897, R I. Pocock. 

 $. Cheadle, Staffs., Nov. 13. 1897, 64 74 20 



E. W. H. Blagg. 

 $. Duuphail, Elginshire, Scotland, Sept. 57 57 19 



19, 1893, W. R. Ogilvie Grant. 



Ireland : 



5 c? s, 2 5 s - Ballaghmoon, Car-"") 



low, Jan. 20 to Mar. 6, 1896, | Max. 103 105 24 



J. G. Symes (e coll. Barrett- j- Mean 93 85 22-6 



Hamilton). Measured by I Min. 85 62 20 



F. Metcalfe. j 



Skull, 

 extreme 

 length. 



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. : — 



Head and 



Tail. 



Hind 



body. 



foot. 



83 



78 



17 



79 



72 



16 



