5u!l. 1091. U. S. Dsot. of Agriculture. 



Plate II. 



Fig. I. — Winter View of Area Inhabited by Kangaroo Rats. 



A water-hole scene on the U. S. Range Reserve at the base ofthe Santa Rita Mountains, Ariz., 

 where cooperative investigations are being conducted to ascertain the relation of rodents to 

 forage. Thisistypicalofalargesectionof country occupied by Dipodomys spectabilis spedabilis 

 and Dipodomys merriami. The brush is mesquite {Prosopis), cat's-claw (Acacia), and palo- 

 verde ( Cercidium). 



Fig. 2. — Kangaroo Rat Country Following Summer Drought. 



An area of the V . S. Range Reserve in the autumn of 1918, showing the result of failure of sum- 

 mer rains. Such a condition is critical not only for the stockmen but also for kangaroo rats 

 and other desert rodents, and results in competition between them as to which shall benefit 

 by what the range has to offer. 



