LEMMUS. DICROSTONYX. 200 



Gcnl. Char. Size small: ears and audital bullae large; brain case 

 produced posteriorly. 



Color. Head and anterior half of upper parts grayish brown 

 mixed with black and yellowish fulvous; posterior half of upper parts 

 rusty fulvous; sides and belly golden fulvous; sides of nose grayish 

 brown; line from nose to beneath ear golden fulvous; feet dusky. 

 Tail, dusky above, buffy below. 



.}feasitrf>iu-nts. Total length, 130; tail vertebra, 17; hind 

 foot, 19.5. 



313. nigripes. {MvoJfs), True, Proc. U. S. Nat. Mus. Wash., 1894, 



p. 242. 



Tyjic locality. St. George Island, Pribyloff Islands, Bering Sea, 

 Alaska. 



Geogr. Distr. Known from tj-pe locality only. 



Color. Above uniform cinnamon gray; cheeks, neck and sides 

 tawny brown; beneath pale tawny; nose black; fore feet black above, 

 tawny below; hind feet black below. 



Measurements. Total length, 130; tail vertebra', 13; hind 

 foot, 17.5. 



5(J. Dicrostonyx. 



I. llli; M. 2=-^ =: 16. 



i-i ' 3-3 



Dicrostonyx. Glog. Gem. Hand u. Hilfsb. d. Naturg., 1841, p. 97. 

 Cuniciilus, Wagl. Isis, 1832, p. 1220. 



Misothermus, Hensel. Zeitsch. Deutsch. Geol. Casselsch., 1S55, 

 vii, p. 492. (Part.) 



Nasals short, posterior termination opposite anterior root of 

 zygoma. Orbits with conspicuously pointed processes. Molar series 

 divergent posteriorly. First upper molar with an anterior transverse 

 triangle, three internal lateral angles, two external lateral angles, and 

 a postero-external loop; middle and last upper molars with an 

 anterior transverse loop, two external and two internal lateral triangles 

 on middle molar, and a small postero-external loop and a trefoil on 

 back molar. First lower molar with an anterior trefoil, three external 

 and four internal closed triangles, and posterior loop. Other lower 

 molars with an antero-external angle, two internal lateral, one exter- 

 nal lateral triangle and posterior transverse loop. Incisors as in 

 I.emmus. Skull similar to Lemmus, but less massive. 



314. hudsoniu5. {Mus), Pallas, N. Sp. Quad. Glirium, 1778, p. 208. 

 xrunlariiiicus, (Afi/s), Traill, in Scoresby's Greenland, 1823, p. 416. 

 uny^ulatus, Baer & Helmersen, Beitr., 1S41, Iv, p. 283. 



Type locality. Greenland. 



