SYNAPTOMYS. DICROSTONYX. GEOMYS. 81 



Genus Synaptomys (83). 



Synaptpmys borealis (Richardson). 



Armcola 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 (/. 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 groenlandicus (Traill). 



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

 Fishery, 1823, p. 416. 

 Type locality. Jameson's Land, Greenland. 



Family Geomyidae. 

 Genus Geomys (89). 



Geomys breviceps llanensis Bailey. 



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

 p. 129. 



Type locality. Llano, Llano County, Texas. 



Genl. Char. Similar to G. bremceps, 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 Treble's specimen, called by 

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



