712 



EODENTIA 



Holland. — Lisse, near Leideu, 4 (Leiden ; cotypes of arenicola de 

 S61ys-Longcbamps) ; Texel Island, 1. 



3 c5. Gausdal, Norway. Christiania Museum (e). 93.3.1.11,13. 



6. Gausdal. Miller Collection. 7. 7. 7. 4536. 



9. Hjerkin, Kristiansamt. Miller Collection. 7. 7. 7. 4535. 



1. Medelpad, W. Norrland, Prof. Sundevall (p). 4'J. 11. 1. 21. 



Sweden. 



1. Tornea, Lappmark, Swe- Prof. Sundevall (p). 45. 10. 25. 10. 



den. 



1. Lapland. Prof. Sundevall (p). 49. 11. 1. 9. 



2. Lapland. Tomes Collection. 7. 1. 1. 141-142. 

 1. Lapland. Jliller Collection. 7. 7. 7. 3250. 



1. Muonionniska, Uleaborg, Stockholm Museum (e). 90. 8. 1. 7. 



Finland. 

 6. Texel Island. Holland. J. L. Bonhote (c & p). 8. 10. 26. 3. 

 1 al. Col pin, Brandenburg, C. Gadow (c & p). 81.10.7.1. 



Germany. 



2. Csall ok oz-Somor j a, Budapest Museum (e). 94.3.1.04-5 



Pressburg, Hungary. 



Sub-Genus CHIONOMYS Miller. 



1857. Paludicola Blasius, Saugetbiere Deutscblands, p. 334 (part). Not of 



Wagler, 1830. 

 1867. Praticola Fatio, Les Campaguols du Bassin du Leman, p. 34 (part). 



Not of Swainson, 1837. 

 1896. Microtus Miller, Nortb American Fauna, No. 12, p. 62, July 23, 1896 



(part). 

 1908. Chionoviys Miller, Ann. and Llag. Nat. Hist., 8th ser., i, p. 97, 



January, 1908. 



r«/pe species. — Arvicola nivalis Martins. 



Geographical distribution. — Mediteri-aneau region from the 

 Pyrenees to the Caucasus and Asia Minor, mostly in or near 

 mountains. 



Characters. — In general like the sub-genus Microtus, but third 

 upper molar with only two re-entrant angles on each side, as in 

 Arvicola and some forms of Pitijmys ; skull with broad, rather 

 flat, smooth brain-case, and wide interorbital region, the temporal 

 ridges low and inconspicuous ; posterior termination of palate 

 essentially as in true Microtus, but with elements usually less 

 well-defined. 



Remarks. — The sub genus Chionomys is a very natural group, 

 whose characters, while for the most part agreeing with those 

 of true Microtus, show a distinct tendency toward Arvicola and 

 Pitymys. Seven forms are now known, all but two of which 

 occur in Europe. One of these inhabits the lowlands of southern 

 France, but all of the others are characteristic mountain animals. 

 The general appearance of the members of this group is highly 

 characteristic as compared with that of the other European 

 species of Microtus. They are medium-sized, rather long-tailed 

 voles with a peculiar slaty greyish general colour, and full, soft 

 fur, the tail often mostly or entirely whitish. 



