550 MURIDZ—APODEMUS 
The skull and teeth have been described above under the species. 
For cranial dimensions, see table at p. 518. 
De Winton (of. cit, 443) mentions that the tail is made up of 
30 vertebra, instead of 27 as in sylvaticus; but de l’Isle (Ann. Scz. 
Nat. Zool., 1865, iv., 215) has pointed out how variable the skeleton of 
the Field Mouse is in such respects. The tail is stated by Adams 
(zz lit.) to be relatively robust as compared with that of sy/vatzcus. 
DIMENSIONS IN MILLIMETRES :— 











Head and | Tail (with- Hind ifocs 5 Weight 
body. out hairs). | (vithou a aD 
claws). grammes. 
SexvuaLLY IMMATURE (OF BOTH SEXES) :— 
Caught and measured by L. E. Adams— 
1, Female, in first pelage, 10th Oct. 1911 68 64 20°5 2s ae 
2. Male, do. 25th July 1911 69 71 21 13 10 
3. Do. do. 29th Oct. 1909 70 70 20°5 
4. Do. do. 9th July 1909 72 73 22 ies 
5. Female, pelage changing, 7th Aug. 1909 86 92 23 25 
6. Male, do. 10th Feb. 1905 89 85 25 a a 
7. Female, do. 80th Dec. 1904 90 78 23 ac 20 
S. Male, do. Sth June 1909 91 100 22 co o. 
9. Do. pelage almost ad., 27th Feb. 1905 95 92 25 are 201 
10. Female, imperforate but perhaps adult, 
Ludlow, Salop, Ist March 1913 104 108 23 17 31 
Herefordshire, young in grey pelage (de 
Winton, Zoologist, 1895, p. arn), male. 68 60 20 16 -. 
Do. do. female . . . $1 84 21 16 ae 
Do. do. do; - ° . . 84 83 22 16 4 
Do. do. male. ; . . 90 83 24 17 
SExXCALLY Mature Mates :— 
Caught and measured by L. E. Adams at 
Reigate, surrey — 
1. 10th Dec. 1904 . . . . 117 115 25 ary 34 
2. 30th Dec. 1904. : . . . 117 116 25 7. 35°5 
3. 8th June 1909 . 5 6 . ° 91 100 22 oe we 
4. 26th June 1909 . . . . . 114 124 24°5 ee 
5. 9th July 1909 . 5 O 5 ° 103 112 24 
6. llth July 1909. : . . 98 108 24 ar 
7. 27th Sept.1909 . . . . . 98 106 24 ee 
8. 8th Oct. 1909 e ° . . . 100 114 25 a 
9. 29th Oct. 1909 . * : ° ° 103 110 25 5 
10. 29th Oct. 1909. ° . . . 100 108 24 5 
11. 29th Oct.1909  . 5 . . . 94 94 23 
12. 8rd Dee. 1909 . . . 5 . 93 102 24 cin “ 
13. 7th Dec. 1909 9 . . 5 . 95 98 23 50 on 
14. 7th March 1910 . . . . . 103 112 23°5 .. 
Bishop's Stortford— 
15. 8th May 1911 : . . . . 104 118 22°5 a5 oa 
16. 26th May1911 . oo" 6 . . 114 122 24 cs 84 
17. 26th May 1911. . . . . 106 118 24 =e, 
Reigate— 
18. 24th May 1912 . ° . . . 100 120 24 17 82 
Ludlow, Salop— 
19. Ist March 1918 . 105 97 23 16 83 
Herefordshire (W. E. de Winton, ; Zoologist, 
1895, p. 870) . 110 112 24 18 
Richmond Hill, Surrey (G. Dalgieish, Zoo- 
logist, Nov. 1104, p. 425) . 119 115 25 = 83°62 
Woolpit, Suffolk (W. D. Parker) a 5 112 120 24 do 
Average of 22 (approximate) . . 105 110°8 24 17 88°7 





1 Testes quite small; pelage almost adult. 
2 Tail imperfect, foot with claws: neither included in average; weight stated as ‘1 oz., plus 1 shilling 
piece ”=1,', oz. 
