CONTENTS OF VOLUME IX 



Plates 1-20 page 



Title-page i 



Contents "i 



Notes on West American Chitons — II 1 



By S. Stillman Berry 

 (Published June 16, 1919) 



Life-Zone Indicators in California 37 



By Harvey Monroe Hall and Joseph Grinnell 

 (Published June 16, 1919) 



Notes on Mammals collected principally in Washington and California 



between the Years 1853 and 1874 by Dr. James Graham Cooper 69 



By Walter P. Taylor 

 (Published July 12, 1919) 



Climatic Relations of the Tertiary and Quaternary Faunas of the 



California Region 123 



By James Perrin Smith 

 (Published July 12, 1919) 



Contribution to the Optics of the Microscope 175 



By C. W. Woodworth 

 (Published July 12, 1919) 



The Gopher-Snakes of Western North America 197 



By John Van Denburgh and Joseph R. Slevin 

 (Published August 26, 1919) 



New Oregon Diptera 221 



By F. R. Cole and A. L. Lovett 

 (Published August 26, 1919) 



Key to the North American Species of the Dipterous Genus Medeterus, 



with Descriptions of New Species 257 



By Millard C. Van Duzee 

 (Published August 26, 1919) 



Description of a New Fossil Fish from Japan 271 



By David Starr Jordan 

 (Published October 22, 1919) 



Notes on the Avifauna of the Inner Coast Range of California 273 



By Joseph Mailliard 

 (Published November 25, 1919) 



New species of Flies (Diptera) from California 297 



By J. R. Malloch 

 (Published December 23, 1919) 



Mechanism in the Production of the Throat-Fan in the Florida Chame- 

 leon, Anolis carolinensis 313 



By Chas. E. von Geldern 

 (Published December 23, 1919) 



New Hemipterous Insects of the Genera Aradus, Phytocoris and 



Camptobrochys 331 



By Edward P. Van Duzee 



(Published February 5, 1920) 



Report of the President of the Academy for the Year 1919 357 



By C. E. Grunsky 

 (Published August 4, 1920) 



Report of the Director of the Museum for the Year 1919 367 



By Barton Warren Evermann 

 (Published August 4, 1920) 



Index 397 



November 17, 1920. 



