PLATE 28 



Surface workings of Mole and Pocket Gopher as photographed in Yoseniite Valley; 



all about i{; natural size. 



a. "Subsurface'' forage run of Mole. 



h. A Mole hill. 



('. An earth niouiul made by a Pocket Gopher. 



For comparative descriptions, see pj). 44, 137. 



[696] 



