APPENDIX 535 



Fam. Mylagaulidae. Horned Gophers. 



t MesogauLiis. M. ]\lioc., N. Amer. 



t Mylagaulus. M. Mioc. to L. Plioc, N. Amer. 



t Ceratogaulus. M. Mioc, N. Amer. 



f Epigaulus. L. Plioc, N. Amer. 



SuPERFAiM. SciuiiOJDKA. Sciuroids. 



Fam. Sciuridae. Sciuinels. 



SuBFAM. NannosciuriuEe. Pigmy Squirrels. 



Nannosciurus. Afr., Philipp., Indo- Austral. 



SuBFAM. Arctomyinse. Marmots, Woodchuck, etc. 



f Palcearclomys. U. Mioc, N. Amer. 



Spermophilm. Spermophile, Suslik. E. Eur., Siberia, W. N. Amer. 



' Arctomys' (^= Ma7-mot(i). INlarmot, Woodchuck, etc. N. Amer. 

 (since U. Mioc.) ; Eur. (since Pleist.), N. & C. As. 



Cynoniys. Prairie Dog. C. U.S.A. (since U. Mioc). 



SuBFAM. Sciurinfe. True Squirrels, Chijjmunks, etc 



Sciurus. Squirrel. Temperate and Trop. Regions of the World, 

 exc. Austral, and Madag. (since U. Olig., Eur. & N. Amer.). 



Tamias. Chipmunk. E. & C. U.S.A. (since Pleist.), S. Canada. 

 SuBFAM. Xerinse. Spiny Squirrels, Giant Squirrels. 



Xerus. Spiny Squirrel. Afr. 



Ratitfa. Giant Squirrel. India, Tndo-China, E. Indies. 

 SuBFAM. Pteromyina?. Flying Squirrels. 



Pteromys. Larger Flying Squirrel. C. & S.E. As., E. Indies. 



Sciuropterus. Lesser Flying Squirrel. N. Amer., As., Eur. 



Eupetaurus. Woolly Flying Squirrel. Thibet. 

 SuPERFAM. C.iSTOROlDKA. Beavers and Beaver-like Rodents. 

 Fam. Castoridae. Beavers. 



f Eutypoinys.^ M. Olig., N. Amer. 



t Stencojiher. M. Olig. to M. Mioc, Eur. ; U. Olig., N. Amer. 



f Eu/idpsis. U. Olig., N. Amer. 



f Chalicomys. U. Mioc to Plioc, Eur. 



■\ ' Dipoiiles' (= Eucas(or). U. Mioc. to Plioc, Eur., As.. & 

 N. Amer. 



f Ilystricops. U. Mioc. to L. Plioc, N. Amer. 



Castor. Beaver. N. Amer. (since Pleist.) ; Eur. (since Plioc) ; 

 W. As. 



f Trogontlicriiim. Pleist., Eur. 



1 Possibly reliited to Pteroiiiyiiiae. 



