20 BULLETIX 1091, U. S. DEPARTMEXT OF AGRICULTURE. { B^^n.^xo^"!. 



A number of the more interesting and representative results of 

 the weighing and analyses of burrow contents are presented here- 

 with in tabular form. The data for each den. or lot. shows in grams 

 the quantity of stored material removed and the best estimate it was 

 possible to make of the percentages or weights of the various species. 

 TTlien the weight was less than 5 grams, the mere trace of the species 

 frequently is indicated in the following tables by the abbreviation 

 ■• Tr." 



Table 1. — Analyses of plants stored hy Dipodomys spectabilis speetabilis Mer- 

 riam. obtained from examination of representative dens (all except Den 2Jf 

 from r. S. Range Reserve, near the Santa Rita Mountains, Ariz.). 



Den 1. 



February 7, 191S. Burrow typical, located on bank of wash in partially 

 denuded grass-land, Boiiteloua rothrockii and weed type: soil sandy; burrow 

 photographed in section fPl. YII. Fig. 1). 



Species stored. Grams. 



Bouteloua rothrockii 2. 205 



Bouteloua aristidoides ( B. eriopoda and B. rothrockii, Tr. ) 1.445 



Plantago ignota ; 442 



Eriogonum polycladon 35 



Total 4,127 



Four species of plants represented in burrow contents CPl. VII, Fig. 2). 

 Maximum quantity for single burrow in series of 22 from Range Reserve. 



Dex 2. 



March 9. 1918. Surroundings overgrazed and partially restored by complete 

 protection. Red soil, with much coarse rough gravel and stone. 



Species stored. Grams. 



Bouteloua rothrockii (nearly pure) 1,460 



Bouteloua rothrockii (mixed with Aristida spp.) 945 



Boerhaavia wrightii 660 



Bouteloua rothrockii 



Bouteloua aristidoides 



Aristida divaricata 



Aristida bromoides 



Kallstroemia laetevirens Tr. 



Heterotheca subaxillaris Tr. 



Plantago ignota 15 



Fleshv fun^i 10 



Total L 3, 615 



Eight species of plants represented by seeds. One species of fleshy fungus 

 in addition. 



