Aristida divaricata 90 to 95 } Chamaecrista leptadenia 10 to 5 } 58 Bouteloua rothrockii Tr. } Prosopis velutina 200 Apodanthera undulata 55 --- Total 313 Five species represented. Two species, _Apodanthera_, and _Chamaecrista leptadenia_, new to storage records. Several whole fruits of _Apodanthera_, about 2 inches in diameter, stored in addition to seeds alone; seeds of this form not previously noted in burrows, but very abundant in this one, indicating importance of the factor of accessibility in storage. 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.