UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 5, No. 29, pp. 421-437 ANDREW C. LAWSON, Editor 



RODENT FAUNA 



OF THE 



LATE TERTIARY BEDS 



AT 



VIRGIN VALLEY AND THOUSAND 

 CREEK, NEVADA 



BY 



LOUISE KELLOGG. 

 CONTENTS. 



PAGE 



Introduction 421 



Arctomys nevadensis, n. sp 422 



Arctomys minor, n. sp. 425 



Citellus, sp 427 



Aplodontia alexandrae Furlong 429 



Mylagaulus monodon Cope 429 



Mylagaulus pristinus Douglass 429 



Eueastor lecontei (Merriam) 430 



Dipoides, sp 431 



Entoptyehus minimus, n. sp 432 



Peromyscus antiquus, n. sp 432 



Peromyscus( ?), sp 433 



Diprionomys parvus, n. gen. and sp 433 



Diprionomys magnus, n. sp 434 



Diprionomys nevadensis, n. sp 434 



Lepus vetus, n. sp 436 



INTRODUCTION. 



The rodent forms described below represent a portion of the 

 mammalian fauna collected during the summer of 1909 by a 

 palaeontological expedition organized and financed by Miss Annie 

 M. Alexander to carry on work in the later Tertiary beds of 



