CONTENTS. 



Page 



Constitution and By-Laws x'n 



Eules Eelating to Publication xii 



Proceedings for 1892 xvii 



The Geographic Distribution of Life in North America, with Special 



Reference to the Mamniaha ; by C. Hart IMerriam 1 



Description of New Plants from Southern California, Nevala, Utah, 



and Arizona ; Vjy Frederick Yernox Coville G5 



Some Interrelations of Plants and Insects ; by C. V. Riley 81 



Third List of Additions to the Flora of Washington, D. C. ; by Tiie- 



ODOR Holm 105 



Plants of the Pribilof Islands, Bering Sea ; by C. Hart Merriam. . . 133 



On Carcharodon mortoni, Gibbes ; by F. A. Lucas 151 



The Fossil Flora of the Bozeman Coal Field ; by F. H. Kxowltox. . 153 

 Note on Lower Cambrian Fossils from Cohassett, Massachusetts ; by 



Charles D. Walcott. 155 



A New Generic Name for the Bering Sea Fur-Seal ; by T. S. Palmer. 156 

 Desci'iption of a New Prairie Dog {Cynomys mexicanus) from Mexico ; 



by C. Hart Merriam 157 



Descrijition of a New Genus and Species of ^lurine Rodent {Xenomys 



nelsoni) from the State of Coliina, Western ^Mexico ; by C. Hart 



Merriam 159 



Descriptions of Nine New Mammals Collected b)' E. W. Nelson in 



the States of Colima and Jalisco, INIexico ; by C. Hart Merriam . 164 

 The Occurrence of Cooper's Lemming IMouse {Symqitomys cooperi) in 



the Atlantic States ; by C. Hart Merriam 175 



(iii) 



