IV CONTENTS. 



By J. Le Conte. 

 Remarks on the American species of the genera Hyla and Rana, - 27C 



By Thomas Sav. 



Descriptions of new American species of the genera Buprestis 



Trachys and Elater, -- 249 



By H. R. Schoolcraft. 

 Remarks on native Silver from Michigan, 247 



By J. Van Rensselaer. 



Notice of Fossil Crustacea from New- Jersey, - - - 195 



Supplement to this Notice, ------- 249 



By L. D. De Schweinitz and J. Torrey. 

 Monograph of the North American species of Carex, - - 283 



