DEN 19.

October 31, November 1, 1919.  In good grass.  Entire burrow system mapped (Fig. 2, p. 29).

Species stored.  Per cent.  Grams.

Aristida spp. (probably mostly divaricata) 98 }
Eriogonum sp Tr. }
Bouteloua rothrockii 1 } 1,813
Bouteloua aristidoides 1 }
Panicum sp Tr. }
Prosopis velutina 1,213
          
                                                     -----
      Total 3,026

Five species represented, in addition to those of Aristida.  Largest storage of Prosopis found.  Mound was near a good-sized mesquite tree.  No storage in subsidiary burrows.

DEN 21.

January 31, 1920.  Male trapped here night of January 29, and suckling female trapped at same place and same opening of mound, night of January 30.  Burrow excavated to secure young, which were found in special nest chamber.

Species stored.  Grams.

Aristida spp. (intimate mixture of undetermined species) 1,115
Eschscholtzia mexicana (from spring of 1919) 48
Opuntia (prickly pear, seeds only, no fruits) 10
          
                                                     -----
      Total 1,173

Three species represented.  Prickly pear hitherto found as fruits only.

DEN 22.

January 1, 1921.  Rather good grass growth here in summer of 1920.  Burrow typical, sandy soil.  Two skulls of former residents unearthed.

        Species stored.  Grams.

Aplopappus gracilis (some B. rothrockii) 1,030
Astragalus nuttallianus 630
Bouteloua rothrockii (some A. gracilis) 530
Sida diffusa 30
Solanum elaeagnifolium (282 fruits) 53
Loeflingia pusilla Tr. 
Bouteloua aristidoides Tr. 
Plantago ignota Tr. 
Lupinus sparsiflorus Tr. 
Old storage (mostly Bouteloua aristidoides with traces of B.
  rothrockii and Aristida divaricata) 60
                                                               -----
      Total 2,333