8 
of pocket rats and pocket mice and the Big-eared Fox are peculiar 
to this zone, the Gambel Partridge, Scott Oriole, Leconte Thrasher, 
Crissal ‘Thrasher, Yellow-headed Tit and Plumbeous Gnatcatcher. 
The large valley known as the Sacramento Valley (northern part), 
and San Joaquin Valley (southern part) may be called the Sacra- 
mento Fauna. ‘The comparatively small area of Lower Austral 
Zone in the southwestern part of the state may be called the San 
Diego Fauna. In the eastern part of the state is a large area of arid 
plain, studded with small barren mountains, known as the Mojave 
Desert. It is principally Lower Austral Zone, but has a few tracts 
sufficiently elevated to reach the Upper Austral and a few very small 
areas of Transition Zone. ‘This area north of the low Colorado 
Desert and west of the bottom lands of the Colorado River may be 
called the Mojave Fauna. 
The Sub-Tropical Zone in California is confined to the bottom 
land along the Colorado River and west in the Colorado Desert, 
which is properly a part of the same bottom lands. Among the 
birds which do not breed above this zone and are found in this 
part of California are the Harris Hawk, probably the Audubon Cara- 
cara, Elf Owl, Vermillion Flycatcher, Abert Towhee and Cooper 
Tanager. ‘This part of the Sub-Tropical Zone may be called the 
Colorado Valley Fauna. 
