SYNAPTOMYS. DICROSTONYX. GEOMYS. 81 



Genus Synaptomys (83). 



Synaptomys borealis (Richardson). 



Arvicola borealis Richardson, Zool. Journ., Ill, 1828, p. 517. 

 Synaptomys (Mictomys) bullatus Preble, Proc. Biol. Soc. Wash., 

 XV, 1902, p. 181; Elliot, Check-List Mamm. N. Am. Cont. 

 and W. Indies, F. C. M. Pub., VI, 1905, p. 258, Zool. Ser. 

 (desc.). 

 Synaptomys borealis Osgood, Proc. Biol. Soc. Wash., XX, 1907, 



p. 49. 



1 Type locality. Fort Franklin, Great Bear Lake, Mackenzie, 

 Canada. 



Mr. Osgood (I. c.} having examined Richardson's type of this 

 species found it to be identical with S. bullatus Preble, and therefore 

 Richardson's name borealis must in the future be the one by which the 

 species is known. 



Genus Dicrostonyx (85). 



Dicrostonyx hudsonius grcenlandicus (Traill). 



Mus grcenlandicus Traill, Scoresby's Journ. Voy. Northern Whale- 

 Fishery, 1823, p. 416. 

 Type locality. Jameson's Land, Greenland. 



Family Geomyidse. 

 Genus Geomys (89). 



Geomys breviceps llanensis Bailey. 



Geomys breviceps llanensis Bailey, N. Am. Fauna, No. 25, 1905, 

 p. 129. 



Type locality. Llano, Llano County, Texas. 



Genl. Char. Similar to G. breviceps, but paler and larger; skull 

 more arched. 



Color. Entire upperparts light liver-brown; back tinged with 

 dusky ; underparts creamy white ; tail buff. Ex type in United States 

 National Museum. 



1 The locality, given in the Check-List (/. c.), "Trout Rock near Fort Rae, Great 

 Slave Lake, Mackenzie, Canada," is of course that of Preble's specimen, called by 

 him 'bullatus,' and now a synonym of borealis: 



