CONTENTS. 



Page 



FOREWORD G. H . Hbckh.. 3 



NATURAL HISTORY OF THE GROUND SQUIRRELS OF CALIFORNIA. _ 



By J. Grinnell and J. Dixon__ 5 



Introduction 5 



Acknowledgments 6 



Key to the Ground Squirrels of California 8 



California Ground Squirrel 9 



Fisher Ground Squirrel 44 



Catalina Island Ground Squirrel . 49 



Douglas Ground Squirrel — 1 52 



Rock Squirrel _ ; 58 



Oregon Ground Squirrel 1_ 59 



Belding Ground Squirrel 67 



Stephens Soft-haired Ground Squirrel 73 



Mohave Ground Squirrel ; 75 



Yuma Round-tailed Ground Squirrel 76 



Death Valley Round-tailed Ground Squirrel 80 



Palm Springs Round-tailed Ground Squirrel 81 



Sierra Golden-mantled Ground Squirrel 83 



Inyo Golden-mantled Ground Squirrel 89 



San Bernardino Golden-mantled Ground Squirrel 92 



Desert Antelope Ground Squirrel 94 



Nelson Antelope Ground Squirrel 103 



Los Banos Antelope Ground Squirrel 110 



Summary of Points of Special Importance from the Standpoint of 



Ground Squirrel Control .- . 112 



Literature Cited 115 



THE COLUMBIAN GROUND SQUIRREL By W. T. Shaw.. 118 



A HISTORY OF GROUND SQUIRREL CONTROL IN CALIFORNIA 



By W. C. Jacobsen__ 129 



A STUDY OF FUMIGATION METHODS FOR KILLING GROUND 



SQUIRRELS By John's. Burd and G. R. Stewart.. 170 



THE RODENT CONTROL DIVISION 



By S. V. Christierson and C. A. Wilkins 174 



RODENT ERADICATION WORK OF THE BIOLOGICAL SURVEY IN 



CALIFORNIA.— '. By F. E. Garlough.. 189 



APPENDIX— FORMULAE FOR DESTROYING RODENTS 198 



Note. — Figures indicating page numbers refer to folios at foot of pages 



O 



