5o6. 78 



CONTENTS 



PAGES 



1. A Study of a Collection of Geese of the Branta canadensis Group 



from the San Joaquin Valley, California, by Harry S. Swarth; 



with plates 1-2 1-24 



2. Nocturnal Wanderings of the California Pocket Gopher, by Harold 



C. Bryant 25-29 



3. The Reptiles of the San Jacinto Area of Southern California, by 



Sarah Rogers Atsatt 31-50 



4. An Account of the Mammals and Birds of the Lower Colorado Val- 



ley with Especial Reference to the Distributional Problems 

 Presented, by Joseph Grinnell; with plates 3-13 51-294 



5. Aplodontia chryseola., a New Mountain Beaver from the Trinity 



Region of Northern California, by Louise Kellogg 295-29(i 



6. A Previously TJndescribed Aplodontia from the Middle North Toast 



of California, by Walter P. Taylor 297-300 



7. A Second Species of t lie Mammalian Genus Microdipodops from 



California, by Joseph Grinnell 301-304 



S. Distribution of River Otters in California, with Description of a 



New Subspecies, by Joseph Grinnell; with plate 14 305-310 



9. Pour New Pocket Gophers from California, by Joseph Grinnell :ill-.'!l(i 



10. Three New Races of Vespertilionid Bats from California, by Hilda 



Wood Grinnell 317-320 



11. Eutamias sonomae, a New Chipmunk from the Inner Northern 



Coast Belt of California, by Joseph Grinnell 321-325 



12. Batrachoseps major and Bufo cognatus californicus, New Amphibia 



from Southern California, by Charles Lewis Camp 327-334 



13. Report upon Mammals and Birds found in Portions of Trinity, Sis 



kiyou and Shasta Counties, California, by Louise Kellogg; 



with plates 15-18 335-398 



14. An Analysis of the Vertebrate fauna of the Trinity Region of 



Northern California, by Joseph Grinnell 401-412 



15. The Status of the Beavers of Western North America, with a 



Consideration of the Factors in their Speciation, by Walter 



P. Taylor 413-495 



16. Two New Aplodontias from Western North America, by Walter 



I'. Taylor ! 497-r,<U 



17. Notes on the Local Distribution anil Habits of the Amphibians and 



Reptiles of Southeastern California in the Vicinity of the Turtle 



Mountains, by Charles Lewis Camp; with plates 19 22 503-544 



Index 545 



Errata 558 



