DICROSTONYX 153 



soil ou the shores of Behriug's Straits," — once the connection is 

 pointed out — i.s, as Mr. Allen says, " unmistakable and describes 

 the highly coloured adult Alaskan Lemming sufficiently well." 



This animal is undoubtedly very closely related to D. torquatus 

 and it is not improbable that when satisfactory material repre- 

 senting the Old World form is acquired, it will be necessary to 

 treat D. rubricalus as a subspecies of D. torquatus. 



3i. Dicrostonyx rubricatus richardsoni Merriam. 



1825. Arvicola grcenlandica Richardson, Parry's Second Voyage, 



App., 1825, p. 304 (part). Not of Traill. 

 1835. Arvicola hudsonia J. C. Ross, J. Ross's Narrative Second 



Voyage. App., 1835, p. xii. 

 1848. 'Myodes hudsonic.us Gray, P.Z.S., 1848, p. 43. 

 1850. Myodes groenlandicus, Gray, App. to Rae's Narrative, Exped. 



Arctic Sea, 1846-1847, 1850, p. 200. 

 1854. Georychus hudsonius, Audubon and Bachman, Quad. N. Amer., 



1854, 3, p. 81 (in part), pi. 119. Not of Pallas. 

 1874. Cunicidus hudsonius Coues, Proc. Acad. Nat. Sci. Philadelphia, 



1874, p. 196 (part). 

 1877. Cuiiiculus torquatus Coues, Monogr. N. Amer. Rodentia, 



Muridre, p. 246 (part). 

 1896. Dicrostonyx torquatus Miller, N. Amer. Fauna, No. 12, pp. 38-40 



(part). 



1900. Dicrostonyx richardsoni, Merriam, Proc. Washington Acad Sci., 

 2, p. 26; Miller, " List," 1912, p. 207. 



1901. Dicrostonyx hudsonius richardsoni Elliot, Field Columbian 

 Mus. Publ., Zool. Ser. 2. p. 211. 



1919. Dicrostonyx rubricalus richardsoni G. M. AUen, Bull. Mus. 

 Comp. Zool., Cambridge, 62, p. 525; Miller, " List," 1924, p. 398. 



Type.— U.S. Nat. Mus., No. ^i-||., Merriam Coll. ; adult male, 

 skin and skull, collected July 1859, by W. MacTavish. 



Type locality. — Fort Churchill, Keewatin, west coast of 

 Hudson's Bay. 



Range. — From the western shore of Hudson's Bay, westwards 

 through Arctic America, meeting and intergrading with D. r. 

 rubricalus in the neighbourhood of Coronation Gulf. 



Characters. — Adults, in summer, of a nearly uniform ruddy 

 grey above, with a black dorsal stripe from nose to tail. Skull 

 with rostrum relatively longer and nasals less tapering than in 

 D. r. rubricalus. Bulh« rather larger. 



For external and cranial measurements, see tables at end of 

 volume. 



Remarks. — As Mr. G. M. Allen remarks this '" is a very strongly 

 marked subspecies and though closely related to the Alaskan 

 rvbricatus, with which it intergrades to the north-westward, it 

 parallels hudsoiius of Labrador in its dull uniform coloration, 

 though it is not so gray as the latter." Specimens from near the 

 type locality are widely different in external appearance from 

 true D. rubricalus and from D. torquatus as may be gathered 

 V.L. M 



