MEMOIRS 



OF THE 



BOSTOiN SOCIETY OF iNATLlRAL HISTORY. 



VOLUME II. PART IV. NUMBER IV. 



PRODKOMF: of a monograph of the TABANlDiE OF THE 



UNITED STATES. 



PART II. THE GENUS TABANUS. 

 WITH APPENDIX AND INDEX TO PARTS I AND 11. 



By C. R. OSTEN SACKEN. 



BOSTON : 



PUBLISHED BY THE SOCIETY. 



April 20, 1876. 



