20 BFLLETIX 1091, U. S. DEPARTMENT OF AGRICULTURE. {^^£0° 1 
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. 
"When the weight was less than 5 grams, the mere trace of the species 
frequently is indicated in the following tables by the abbreviation 
« Xr „ 
Table 1. — Analyses of plants stored by Dipodomys spectabilis spectabilis Mer? 
riam. obtained from examination of representative dens (all except Den 2-'f 
from U. S. Range Reserve, near the Santa Rita Mountains, Ariz.). 
Den 1. 
February 7. 1918. Burrow typical, located on bank of 'wash in partially 
denuded grass-land. Bouteloua rothrockii and weed type; soil sandy; burrow 
photographed in section (PI. VII, Fig. 1). 
Species stored. Grams. 
Bouteloua rothrockii 2. 205 
Bouteloua aristidoides (B. eriopoda and B. rothrockii, Tr.) 1.44.". 
Plantago ignota 442 
Eriogonum polycladon 35 
Total 4,127 
Four species of plants represented in burrow contents (PL VII, Fig. 2). 
Maximum quantity for single burrow in series of 22 from Range Reserve. 
Den 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 
595 
Aristida divaricata 
Aristida bromoides . 
Kallstroemia laetevirens Tr. 
Heterotheca subaxillaris Tr. 
Plantago ignota _ 15 
Fleshy fungi 10 
Total 3,615 
Eight species of plants represented by seeds. One species of fleshy fungus 
in addition. 
