398 BULLETIN 128, UNITED STATES NATIONAL MUSEUM. 



t*Dicrostonyx nibricatus richardsoni (Merriam). 



1900. Dicrostonyx richardsoni Merriam, Proc. Washington Acad. 



Sci., vol. 2, p. 26, March 14, 1900. 

 1919. Dicrostonyx rubricatus richardsoni G. M. Allen, Bull. 



Mus. Comp. Zool., vol. 62, p. 525. February, 1919. 

 Type Locality. — Fort Churchill, west shore of Hudson Bay, 



Keewatin, Canada. 

 Range. — [Barren grounds from the west shore of Hudson Bay 



to eastern Mackenzie.] 



t*Dicrostonyx rubricatus unalascensis (Merriam). 



1900. Dicrostonyx unalascensis Merriam, Proc. Washington 



Acad. Sci., vol. 2, p. 25. March 14, 1900. 

 1919. Dicrostonyx rubricatus unalascensis G. M. Allen, Bull. 



Mus. Comp. Zool., vol. 62, p. 530. February, 1919. 

 Type Locality. — Unalaska, Alaska. 

 Range. — Confined, so far as known, to the island of Unalaska, 



Alaska Peninsula. 



Dicrostonyx exsul G. M. Allen. 



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



vol. 62, p. 532. February, 1919. 

 Type Locality. — St. Lawrence Island, Bering Sea, Alaska. 

 Range. — This insular species is confined to St. Laurence Island. 



*Dicrostonyx groenlandicus (Traill). 



1823. Mus groenlandicus Traill, Scoresby's Journ. Voy. northern 

 Whale-Fishery, p. 416. 



1911. Dicrostonyx hudsonius groenlandicus Jacobi, Abhandl. u. 

 Berichte k. Zool. u. Anthrop.-Ethnol. Mus. Dresden, vol. 13, 

 1908, No. 4, p. 9. 1911. 



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

 ZooL, vol. 62, p. 533. February, 1919. 



Type Locality. — Jameson's Land, Greenland. 



Range. — The Greenland Collard Lemming is found from about 

 latitude 69° N. on the east coast of Greenland, northward to 

 the limit of land, 83° 24', and thence westward along the 

 coast of North Greenland to the Kane Basin, and across the 

 Robeson Channel to Grinnell Land, Ellesmere Land, and 

 south to Baffin Land. 



Group MICROTI. (Voles.) 



Genus PHENACOMYS Merriam.°« 



1889. Phenacomys Merriam, North Amer. Fauna, No. 2, p. 28. 



October 30, 1889. Type, Phenacomys intermedius Merriam. 

 1915. Arhorimus Taylor, Proc. California Acad. Sci., ser. 4, 



vol. 5, p. 119. December 30, 1915. Type, Phenacomys lon- 



gicaudus, True. 



9» Revised by Miller, Proc. Biol. Soc. Washington vol. 11, pp. 77-87, Apr. 21, 1897, but this paper can 

 no longer be regarded as authoritative. 



