June, '02] - ENTOMOLOGICAL NEWS. 201 



Northern coast and Sierra Nevada have 



in common . , . . . 23 " 

 Northern coast and southern coast have 



in common . . . . . 17 " 



Southern coast and Sierra Nevada have 



in common . . . . . 4 " 



All divisions, except desert, share . . 27 " 



A number of species common to northern coast and Sierra 

 Nevadas are found in the neighborhood of Mt. Shasta, where 

 the two mountain ranges merge, and from which point the 

 species range southerly, sometimes in the Sierras, sometimes 

 in the coast, sometimes in both. 



In order to compare and correlate plant and insect distribu- 

 tion as far as possible, an invitation was extended to Miss 

 Alice Eastwood, Curator of the Herbarium of the California 

 Academy Natural Sciences, to present her views upon the 

 Floral Areas of California. Miss Eastwood responded, and 

 among the many instructive things she said the following were 

 to the point : — "At first sight it would seem that it would not 

 be possible to draw a line between Central and Northern Cali- 

 fornia, as there is no mountain chain here to make a natural 

 barrier. However, San Francisco Bay and the great rivers 

 that empty their waters therein can approximately be used. 



" The flora also suggests this division. In the coast mount- 

 ains, Mt. Talmalpais may be taken as the southern landmark 

 of the northern flora and Mt. Diablo the most northern of the 

 southern. 



"On the former mountain Qtiercus garryana, Rhododen- 

 dron californicum and Ceanothus vehitinus find their southern 

 limit. These are all species most abundant and characteristic 

 in the north. On the latter mountain Pinus torreyana and 

 Ardostaphylos glajua find their most northern home, and these 

 species are characteristic of the flora of the southern coast 

 mountains. 



"In the Sierra Nevada the line reaches the Yosemite or some 

 point north of it, perhaps the Calaveras grove of Sequoia. It 

 is in this region that Arbutus menziesii ceases to grow, and 

 that the Douglas spruce finds its southern home." 



