Plate iv. 



Fig. 1. — Range Conditions Favoring Kangaroo Rats. 



View on higher portion of Range Reserve, showing type of country where Di-podomys s. spedabilis 

 is most abundant. Good growth of grama and needle grasses in October, following summer 

 growth and before grazing off by cattle and rodents. 



Fig. 2. — Range Conditions Less Favorable to Kangaroo Rats. 



View on lower portion of Range Reserve, where Dipodomys s. spectabilis is less abundant. Vege- 

 tation consists principally of Lycium, mesquite, rabbit brush, and cactus, there being very 

 little gra<5S. 



