GEOLOGICAL SURVEY OF THE TERRITORIES. 



( Sub-family Castorince. ) 

 Castor canadensis^ Kubl, (American beaver:) 



665 



Hah. — Throughout the entire area of North America. 



Family 10. — SACCOMYiDiE. 

 ( Sub-family Geomyincv.) 

 Thomomys fiilvus, (mountain pocket rat:) 



Hab. — San Francisco Mountains, New Mexico, to Fort Yuma and San 

 Diego, northward in Eocky Mountains to Montana. 



Family 11. — Mitrid^. 



(Sub-family Dlpod'mw.) 



Jaculus Jiudso7iius, (jumping mouse :) 



Hah. — Nova Scotia, ( Labrador, Pennant,) to Southern Pennsylvania, 

 and west to the Pacific Ocean. 



( Sub-family Murincv.) 

 Mks imisculiis, Linn., (common mouse:) 



Hah. — North America generally. 



