Smithsonian Report, 1926.—Grinnell PLATE 1 
1. A POCKET GOPHER, THOMOMYS BOTTAE, PHOTOGRAPHED FROM FRESHLY 
CAUGHT SPECIMEN, SHOWING EXTERNAL STRUCTURAL FEATURES CORRE- 
LATED IN THIS SCIUROID RODENT WITH SUBTERRANEAN MODE OF LIFE 
About one-half natural size. (See text, p. 344) 
2. SKULL OF A POCKET GOPHER, THOMOMYS BOTTAE (AT LEFT), CON- 
TRASTED WITH SKULL OF A TREE-INHABITING SQUIRREL, SCIURUS 
DOUGLASII (AT RIGHT); BOTH NATURAL SIZE 
The body weights of the two animals were approximately the same, namely, 225 grams. 
Note the reat development, of the facial parts of the gopher’s skull, as also the reduction 
of the orbit and the heavy ridging of the brain case. (See text, p. 345) 
