Vol. IX] HALL & GRINNELL— LIFE-ZONE INDICATORS 51 



LOWER SONORAN ZONE— Continued 



Perognathus fallax pallidus Mearns 



Perognathus californicus ochrus Osgood 



Perognathus spinatus spinatus Merriam 



Perodipus tularensis Merriam 



Perodipus swarthi Grinnell 



Perodipus dixoni Grinnell 



Perodipus mohavensis Grinnell 



Perodipus ingens Merriam 



Perodipus microps Merriam U 



Perodipus levipes Merriam 



Dipodomys deserti Stephens 



Dipodomys merriami simiolus Rhoads 



Dipodomys merriami parvus Rhoads 



Dipodomys merriami nitratoides Merriam 



Dipodomys merriami exilis Merriam 



Citellus tereticaudus tereticaudus (Baird) 



Citellus tereticaudus chlorus Elliot 



Citellus tereticaudus eremonomus Elliot 



Citellus mohavensis (Merriam) 



Ammospermophilus leucurus leucurus (Merriam) U 



Ammospermophilus nelsoni nelsoni (Merriam) 



Ammospermophilus nelsoni amplus Taylor 



Lepus californicus richardsoni Bachman 



Lepus californicus deserticola Mearns U 



Sylvilagus auduboni vallicola Nelson 



Sylvilagus auduboni arizonae (J. A. Allen) 



Cervus nannodes Merriam 



Odocoileus hemionus eremicus (Mearns) 



Ovis canadensis nelsoni Merriam U 



UPPER SONORAN ZONE 



Species closely restricted to this zone, and particularly characteristic of it, are 

 marked with a star (*). Species marked L occur also in the Lower Sonoran Zone; 

 those marked T occur also in the Transition; those marked C occur also in the 

 Canadian. 



Plants 

 Ephedra viridis Coville 

 Cupressus macnabiana Murray 

 Cupressus sargentii Jepson 

 Juniperus californica Carr. L 



