4 NEW YORK STATE MUSEUM 



granted the privilege of studying the LeConte and other collections 

 at Cambridge, Dr H. G. Dyar, who procured the loan of material 

 from the National Museum, Mr E. A. Schwarz, who furnished facili- 

 ties and aid in studying the collections at Washington, and also the 

 following gentlemen, who rendered various services, Messrs Charles 

 Schaeffer, Frederick Blanchard, F. C. Bowditch, Germain Beaulieu, 

 H. G. Klages, Charles W. Leng, C. V. Piper, W. S. Marshall, J. J. 

 Rivers, Charles Fuchs, Dr D. M. Castle, E. D. Harris, Philip Lau- 

 rent, F. E. Watson, C. W. Woodward, H. C. Fall, William T. Davis, 

 C J. S. Bethune, F. M. Webster, Charles Palm, W. Knaus, A. F. 

 Winne, .Dr R. E. Kunze, Charles Stevenson and C. J. Oeillet. Dr 

 Henry C. Van Dyke kindly contributed notes on localities of 

 h o r n i i , and a number of New York collectors kindly allowed us 

 th€ privilege of examining the material in their collections. 



The junior author has collected members of this genus for a num- 

 ber of years and has made many trips about New York city to secure 

 their workings, often in the company of his friend, William T. 

 Davis, who took much interest in securing desirable specimens. All of 

 the species have been bred but the typical populnea, mutica, 

 h o r n i i and c r e t a t a , though we have had workings of the latter. 



The junior author has undertaken the illustration and systematic 

 study of the species ; while his associate has studied the insects more 

 particularly from an economic standpoint and has summarized the 

 literature and compiled the bibliographies. 



GENUS SAPERDA OF FABRICIUS 



This genus is one of great economic importance, since it contains 

 two species which are very injurious to appletrees and another which 

 may possibly acquire this habit. One species is known as being very 

 destructive to the American elm, one often seriously injures hickory, 

 another' sometimes destroys large numbers of our lindens, and a 

 fourth is exceedingly injurious to poplars ; the latter are also attacked 

 by several other species of the genus. 



This group is also of interest to the systematic student, since it 

 shows in a limited number of species great divergence and specializa- 

 tion from a common type. Much confusion has hitherto existed con- 

 cerning the identity of our western species, and this was only partly 



