614 RODENTIA 



above is somewhat less broadened than in the larger animal, and 

 the emargination of posterior border of palate extends relatively 

 further forward : to level of last prism of iir, instead of to level 

 of first prism of m^, anteoi'bital foramen with slit-like lower 

 portion so shortened as to be practical^ absent. 



In the few specimens examined the inner border of cutting 

 edge of upper incisor is less folded backward than in Lemmus 

 lemmuii, and the outer re-entrant angle of yn.^ is occasionally so 

 little developed that it fails to cut off a distinct triangle from 

 outer extremity of second transverse loop, a condition, rarely, if 

 ever, found in L. lemmus. 



Measurements. — Adult (old) female from Eidsvold, Norway 

 (in alcohol) : head and body, 95 ; tail, 19 ; hind foot, 15 '4 ; ear 

 from meatus, 10. For cranial measurements see Table, p. 613. 



Specimens examined. — Fifteen, from the following localities: — 

 Norway : Hurdalen, Gudbrandsdal, 1 ; Fluberg, Hadeland, 2 (B.M. and 



U.S.N.M.) ; Eidsvold, Akershus, 2 ; Keen, Ohristiania, 1. 



Sweden: Nerike, Wermland, 2 (U.S.N.M.); Upsala, 1 (U.S.N.M.); 



Medelpad, W. Norrland, 4 ; no exact locality, 1 (U.S.N.M.) ; Dalarne, 1. 



1. Hurdalen, Gudbrandsdal, Dr. R. CoUett (p). 84. 10. 31. 3. 

 Norway. 



6 juv. Fluberg, Hadeland. Ohristiania Museum 98. 3. 1. 18. 



(b). 



2 ? al. Eidsvold, Akershus. Dr. R. Collett (p). 84. 10. 31. 1-2. 



6 juv. Heen, Ohristiania. Ohristiania Museum 93. 3. 1. 19. 



(E). 



2c5juv. Medelpad, W. Norrland, Lord Lilford (p). 11.1.1.111-114. 



2 ? juv. Sweden. 

 1 al. Dalarne. Stockholm Museum 90. 8. 1. 18. 



(e). 



Genus LEMMUS Link. 



1795. Lemmus Link. Zool. Beytriige, i, pt. ii, p. 75. Type by tautonymy 



Mas lemmus Linnaeus. 

 1811. Myodes Pallas, Zoogr. Rosso-Asiat., i, p. 172 (part). 

 1877. Myodes Ooues, Monogr. N. Amer. Rodentia, p. 237. 

 1896. Lemmus Miller, N. Amer. Fauna, No. 12, p. 36, July 23, 1896. 



Type species. — Mus lemmus Linnoeus. 



Geographical distribution. — Arctic region of both hemispheres ; 

 in Europe south to southern Norway. 



Characters. — General foi'm noticeably heavier and more 

 robust than in the voles ; legs and tail short ; feet broad, the 

 palm and sole covered with a dense growth of stiffened hairs, 

 under which are concealed the rudimentary, functionless 

 tubercles ; metacarples of third and fourth fingers much shorter 

 than phalanges ; ungual phalanges of manus greatly enlarged, 

 slightly longer than first and second phalanges combined, the 

 claws enlarged but simple; ear well developed though small, 



