1904.] ' [natural sciences of Philadelphia. 589 



Sciurus douglassii albolimbatus Allen. 



Two from Pyramid Peak, June 22, and one from Mount Tallac, 

 June 27. 



Sciuropterus alpinus lascivus Bangs. 



Two topotypes. Mount Tallac. July 6 and 8. While these agree 

 with Bangs' diagnosis, they are certainly very close to S. a. californicus 

 Rhoads, of which I have the type before me. 



Arctomys flaviventer Aud. and Bach. 



Two from Mount Tallac, June 13 and July 4. 



Neotoma desertorum Merriam. 



Gardnerville, Nevada. Eight specimens. 



Neotoma cinerea (Ord.). 



A series from Mount Tallac. 



Peromyscus texanus deserticola (Mearns). 



A large series from i\Iount Sugar and Gardnerville, Nevada, seem 

 referable to this race. 

 Peromyscus texanus artemisiae (Rhoads). 



A number of specimens from Slippery Ford, El Dorado county, 

 agree well with Rhoads' type series. 

 Zapus trinotatus alleni Elliot. 



A series from Mount Tallac and Slippery Ford. 



Microtus mordax (Merriam). 



One from Mount Sugar, Nevada, kindly identified by Mr, Vernon 

 Bailey. 



Thomomys monticola Allen. 



Three specimens from Slippery Ford, El Dorado county, one of 

 which is changing from the purplish-brown pelage to a bright yellow- 

 brown. 

 Thomomys aureus perpes Merriam. 



Four specimens from Mount Sugar, Nevada. 

 Lepus arizonae (Allen). 



Gardnerville, Nevada, One specimen, July 12. 



Lepus californicus Gray. 

 Valley Springs, June 2. 



Ochotona schisticeps (Merriam). 



Three from Mount Tallac, June 12, June 26 and July 8. 



Sorex obscurus (Merriam). 



One specimen. Slippery Ford, June 8. 



