DICROSTONYX 155 



4. Dicrostonyx exsul G. M. Allen. 



1887. Ciuikulalns torqualus Nelson, Rept. Nat. Hist. Collect. Alaska, 

 1887, p. 278 (part). 



1919. Dicrostonyx exsul G. M. Allen, Bull. Mus. Comp. Zool., Cam- 

 bridge, 62, p. 532; Miller, " List," 1924, p. 398. 



Type— Mus. Comp. Zool., Harvard College, No. 11,885; 

 adult male, skin and skull, collected June 24, 1913, by J. Dixon. 



Type locality. — St. Lawrence Island, Behring Sea. 



Range. — Only known from the type locality. 



Characters. — " Similar to rubricatus, but coloring much less 

 intense, more grayish throughout. Skull with more abruptly 

 narrowed nasals, their proximal ends bevelled sharply to a median 

 point instead of tapering gradually; interparietal more nearly 

 square in general outline " (G. M. Allen, 1919, p. 532). 



Colour of adults in summer pelage. — Pinkish grey above, 

 blacker on the rump, with an indistinct blackish dorsal line. 

 Each ear-patch a mixture of ochraceous buff and tawny. Throat 

 heavily washed with tawny. 



For external and cranial measurements, see tables at end of 

 volume. 



5. Dicrostonyx groenlandicus Traill. 



1823. Mus gra'tilandicus Traill, Scoresby's Journ. Voyage Northern 

 Whale-fishery, p. 416. 



1824. Lemrnus hudsonius Sabine, Parry's Voyage, Suppl. to App., 

 p. clxxxviii. Not of Pallas. 



1843. Mijodes groenlandicus Wagner, Schreber's Saugethiere, Suppl., 



3, p. 606. 

 1845. Lemnus [sic] groenlandicus Schinz, Synopsis Mamm., 2, p. 256. 

 1850. Ml/odes hudsonius Gray, App. to Rae's Narr. Exped. Arctic 



Sea, 1846-1847, p. 200. 

 1857. Hypudceus gramlandicus Reinhardt, Rink's Gronl. geogr. stat. 



beskriv., p. 8. 

 1868. Myodes lorquatus var. granlandicus Bro\vn, Proc. Zool. Soc, 



1868, p. 3.50. 

 1877. Myodes torqualus Feilden, Zoologist [3], 1, p. 320; Winge, 



Medd. cm Gronland, 21, 1902, p. 382. Not of Pallas, 1778. 

 1886. Cuniculus torqualus Greely, Tliree Years of Arctic Service, 2, 



p. 363 (part). 

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



(part). 

 1901. Dicroslnni/.r hudsonius Elliot, Field Columbian Mus. Publ., 



Zool. Ser. 2, p. 209. Not of Pallas, 1778. 

 ISUl. Dicrostonyx hudsonius grmnlandicus .Jacobi, Abh. u. Ber. 



k. zool. antiirop-ethnogr. Mus. Dresden, 12, No. 4. p. 8; Miller 



" List," 1912, p. 207. 

 1919. Dicrostonyx groenlandicus G. M. Allen, Bull. Mus. Comp. Zool., 



Cambridge, 62, p. 533 ; Miller, " List," 1924, p. 398. 



Type. — Unknown. 



Type locality. — Jameson's Land, East Greenland, in lat. 7F N. 



