CONTENTS. 



, Page 



Constitution and By-Laws vii 



Rules Relating to Publication xii 



Proceedings for 1892 xvii 



The Geographic Distribution of Life in North America, with Special 



Reference to the Mammalia ; by C. HART MERRIAM 1 



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



and Arizona ; by FREDERICK VERNON COVILLE 65 



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 



Jn Carcharodon mortoni, Gibbes ; by F. A. LUCAS 151 



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

 Description of a New Prairie Dog (Cynomys mexicanus) from Mexico ; 



by C. HART MERRIAM 157 



Description of a New Genus and Species of Murine Rodent (Xenomys 



nelsoni) from the State of Colima, Western Mexico ; by C. HART 



MERRIAM 159 



Descriptions of Nine New Mammals Collected by E. W. Nelson in 



the States of Colima and Jalisco, Mexico ; by C. HART MERRIAM . 164 

 The Occurrence of Cooper's Lemming Mouse (Synaptomys cooperi) in 



the Atlantic States ; by C. HART MERRIAM 175 



