l^p!^s"a.} I^IFE HISTORY OF THE KANGAROO RAT. 23 



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 suc4iling 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 onlj-, no fruits) 10 



Total - 1,173 



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



Den 22. 



January 1, 1921. Rather good gi-ass growth here in summer of 1920. Bur- 

 row typical, sandy soil. Two skulls of former residents unearthed. 



Species stored. Grams. 



Aplopappus gracilis (some B. rotlirockii) 1,030 



Astragalus nuttallianus 630 



Bouteloua rothrockii (some A. gracilis) 530 



Sida diffusa 30 



Solanum elaeagnifolium (282 fruits) 53 



Loefiingia 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 



Eleven species represented. First instance of quantity storage of Aplopappus 

 gracilis. First occurrence of Loefiingia pusilla and Astragalus nuttallianus. 



Den 24. 



November S, 1921. On mesa northeast of Albuquerque, N. Mex., near base 

 of Sandia Mountains. Fair grass growth here during preceding summer. 



Species stored. Grams. 



Sporobolus cryptandrus strictus 5.455 



Salsola pestifer 295 



Total 5,750 



Two species represented. The heads of Sporobolus cryptandrus strictus are 

 retained to a great extent within the leaf sheaths. This necessitates the cutting 

 of the stems into suitable lengths for carrying, and the stored material appears to 

 be merely cut sections of the stems. Close examination, however, discloses the 

 heads within, and shows that as in other instances seed storage is the end 

 sought. These pieces are packed beautifully parallel like so many matches. 



