Smithsonian Report, 1923. — Grinnell 



Plate I 









MS* .■>'■» ;;Vy 



I. Illustrates Extent to Which the Ground May Be Worked Over 

 and Perforated by Burrowing Rodents (in This Case Dipodomys 

 and perognathus) 



Photo taken by J. Grinnell May 4, 1911, near Earlimart, Tulare County, California 



2. A Pocket Gopher, Thomomys bottae pascalis, Photographed From 

 Freshly Taken Specimen to Show Certain Structural Features; 

 for Instance, Upper Incisors Projecting Beyond Furry Orifice 

 of Mouth. 



Snelling, Merced County, California, May 28, 1915. Photo by C. D. Holliger 



