VIII THE SCOLYTID BEETLES. 



(1890-94), rendered by Mr. E. A. Schwarz, of the U. S. National 

 Museum, Oberforster W. Eichhoff, of Strasburg, Germany, Mr. W. H. 

 F. Blandford, of London, England, and M. L. Villard, of Lyon, 

 France. Messrs. Eichhoff and Schwarz especially were most kind 

 and generous in furnishing identifications of species and in liberally 

 loaning and donating specimens. Finally, the writer wishes to ac- 

 knowledge the help of his associates and assistants during the prose- 

 cution of the work, and especially Mr. W. E. Rumsey, of the West 

 Virginia Experiment Station, and the office and field force of the 

 Branch of Forest Insect Investigations, in the Bureau of Entomology. 



A. D. H. 



