INTRODUCTION. 7 



was used for the same purpose e. g. (Acrobasis nebulo, Walsh). The 

 same plan is adopted throughout this Bulletin. 



It had always been my intention to publish a tenth volume and to end 

 the decade with a review of, and general index to, the whole series. In- 

 deed, an appropriation for the tenth year's work was made and the tenth 

 report would have been duly issued had I not been called at the time to 

 my present work for the General Government. This Bulletin is, in a 

 measure, the fulfillment of that intention, and is issued in the hope that 

 it will render the Reports more serviceable to the student of insect life 

 and to those having to deal with insects injurious to agriculture. 



My thanks are due to Messrs. E. A. Schwarz and W. H. Patton, 

 agents of the Commission, for aid in its preparation. 



C. V. R. 



WASHINGTON, D. C., March 1, 1881. 



