6 
Warbler. The Californian part of the Boreal Zone may be called the 
Californian Alpine Fauna. 
The Transition Zone is of considerable extent in northern Cali- 
fornia, but is of less extent in the southern part of the state, where it 
is limited to the sides and upper parts of the mountains, except that 
small part rising above about 7,000 feet altitude, which is Boreal. 
In most parts of the state the Transition Zone is well timbered, and 
is the great source of supply of wood and lumber in this state. ‘The 
Yellow, Black and Sugar Pines, White Fir, Cedar and Redwood are 
characteristic of this zone. It contains a large number of species of 
birds and mammals, though few, perhaps none, are limited to it, 
nearly all its species being found in the adjoining zones, either above 
or below. Some of the birds breeding principally in it are the Cali- 
fornian Woodpecker, Blue-fronted Jay, Californian Purple Finch, 
Violet-green Swallow and Mountain Chickadee. 
The Transition zone in California may be divided into several 
Faunas. ‘The northeast part of the state, north of Honey Lake and 
east of Mt. Shasta, may be called the Modoc Fauna. It is a high 
broken plateau with some coniferous timber on the highest parts. 
A character of this Fauna is the abundant presence of sage brush 
(Artemesia). South of the Modoc Fauna is a large area of the 
Transition Zone in the lower parts of the Sierra Nevada Mountains 
which may be called the Sierra Nevada Fauna. It is mostly well 
timbered, with Yellow Pine as the principal species. Those areas of 
the Transition Zone lying south of Lat. 35 degrees may appropriately 
take the name of the San Bernardino Fauna. Here also the Yellow 
Pine is a characteristic tree. The region about Mt. Shasta, north to 
Oregon and west to the low strip along the sea coast may provision- 
ally take the name of the Shasta Fauna until its features are better 
known. I know nothing of this fauna personally and I can find 
very little published concerning its faunal conditions. A narrow 
strip along the seacoast from the Oregon line south to San Francisco 
may be called the Humboldt Fauna. This is a region of heavy rain- 
fall and fogs, and a strong character is the presence of heavy red- 
wood forests. A continuance of this narrow strip along the coast 
southward, including the Santa Cruz Mountains, and ending a short 
distance south of Point Sur, may take the name of the Santa Cruz 
Fauna. It presents similar characters to that of the Humboldt Fauna, 
but in a less marked degree. 
