PLATE 16. 



Fig. 3. Burrows of the Trinity mountain beaver (Aplodontia clirijs- 

 eola) near Hunters' Camp, Grizzly Creek Canon, Trinity County, Califor- 

 nia. Photograph taken July 19, 1911. The animals had taken advantage 

 of the protection afforded by the tangled roots of a fallen tree. Although 

 the ground was here dry, there was running water within a few yards 

 to one side. 



Fig. 4. Mouth of burrow of Aplodontia chryseola, showing heap of 

 freshly-cut vegetation. Photograph taken near Hunters' Camp, Grizzly 

 Creek Canon, Trinity County, California, July 19, 1911. The presence 

 in this locality, as well as at several other points, of cuttings of grass 

 and leaves seems to establish the fact that these mammals gather and 

 dry vegetable materials for subsequent use. 



[394] 



