1913] Grinnell^Swarth: Birds and Mammals of San Jacinto 219 



The way in which the associational conception is made use 

 of, will be more clearly perceived by reference to the distribu- 

 liona! treatment of individual species. Let it suffice her' 1 to list 

 some of the conspicuous associations, and then cite some instances 

 in illustration of how these terms are used. 



Associations in the San Jacinto Area 



Op Major Bank Of Minor Rank 



Chaparral Adenostoma 



Sage-brush 

 Scrub-oak 

 Chinquapin 



Forest Live-oak 



Yellow Pine 

 Silver Fir 



Riparian Willow 



Chilopsis 

 Mesquite 



Rupestrine 



Meadow 



Sand-flat Aeolian 



Wash 



It is thus patent that a given major association may be present 

 in several zones and faunas, but its minor divisions are much 

 more restricted. 



In definitely diagnosing the faunistic position of a species it 

 may become necessary to use all three of these distributional 

 conceptions. As examples: (1) Sylvilagus b. cinerascens and 

 Vireo vicinior in the San Jacinto area are members of the Aden- 

 ostoma minor association, of the Chaparral major association, 

 of the San Diegan Faunal district of the Upper Sonoran Zone ; 

 (2) Passerella i. stephensi belongs to the Chinquapin minor asso- 

 ciation, of the Chaparral major association, of the San Ber- 

 nardino Faunal division of the Transition zone; (3) Perognathus 

 spinatus and Peromyscus c. stephensi belong to the Rupestrine 

 association of the Colorado Desert fauna of the Lower Sonoran 

 zone. 



