230 TEN YEAES IN SWEDEN. 



44. Mus SYLVATICUS, L. Skogs Mus. The Long-tailed 



Field Mouse. D. F. 



A sharp division between the yellow-grey or rusty 

 brown upper, and white under part; ears the length 

 of half the head ; tail a little shorter than the body. 

 Length 4 in. ; tail 3-i- in. ; colour duller in winter. 

 Is spread over the whole country, except Lapland. 



45. Mus MUSCULUS, L. Hus Mus. The Common Mouse. 



D. F. 



Colour above dull grey, by degrees joining the pale 

 grey or dirty white under parts of the body ; ears half as 

 long as head. Length 3 in. ; tail 3 in. 

 Is spread almost all orer Scandinavia, where the dwell- 

 ings of man are found, although I never could hear of it in 

 Lapland. It is, however, found both in Iceland and Siberia, 

 although not in Kamtschatka. I have a doubt, however, 

 whether the Iceland mouse is identical with our common 

 mus musculus. 



The mus agrarius, Pall., which much resembles mus syl- 

 vaticusy has been observed in Denmark, never in Scandi- 

 navia ; and the little harvest mouse, mus minutus, Pall., which 

 has been taken both in Denmark and Finland, has been 

 probably overlooked in Sweden and Norway. 



Gen. Lemmus, Geoff. 



Tail covered with short hair, never so long as half the 

 body; ears hidden; molars composite, without tubercles 

 even on the top ; all the streaks on the molars zig-zag. 



46. LEMMUS AMPHIBIUS, L. Storre Jord Eatta. The Water 



Yole. D. F. 



Tail about half the length of the body and unicolorous ; 

 ears hidden; colour black cr brown above, under brown 

 grey; lips white. Length 6 in. 4 1. ; tail 4 in. 2 1. 

 Varies very much in colour. 



Is met with in many parts of this continent, from the 

 very south up to within the polar circle. I obtained a very 



