98 H. C. FALL. 



vanced either by earlier or later authors. The number of species 

 known to us has greatly increased in the forty years that have 

 elapsed since this memoir was published, but the sequence of genera 

 adopted in the present essay does not differ very greatly from that 

 suggested by our most philosophical Coleopterist. 



The preparation of the present paper was begun nearly two years 

 ago, since which time it has absorbed the major portion of the 

 time which the writer could spare for Entomological work. The 

 task has not been a light one nor are the results in all respects what 

 the author could wish, but whatever the degree of success attained 

 it is in no small part due to the prompt and generous responses that 

 have almost invariably been made to all appeals for information or 

 specimens. It is a pleasure to acknowledge the assistance rendered 

 in this way by numerous friends and correspondents, more especially 

 to Messrs. Blanchard, Bowditch and Hay ward of Massachusetts; 

 Schaeffer, Beyer and Palm of New York ; Liebeck and Boerner of 

 Philadelphia; Schwarz, Chittenden and Barber of AVashington ; 

 Dury of Cincinnati ; Wickham of Iowa; Knaus of Kansas, and 

 Fuchs, Van Dyke, Fenyes, Blaisdell and Hopping of California. 

 Nearly all of whom sent me the greater part of their material for 

 study. 



To Mr. Blanchard I am especially indebted for numerous valu- 

 able descriptive and critical notes upon the LeConte material, as well 

 as a continued helpful interest in the progress of the work. 



My heartiest thanks are due to Mr. Henshaw of the Museum of 

 Comparative Zoology at Cambridge, Mass., for the privilege of 

 making a subsequent personal examination of the LeConte types ; 

 to Dr. Howard and Mr. Schwarz of the National Museum, Dr. 

 Skinner of the Philadelphia Academy and to Dr. Holland of the 

 Carnegie Museum at Pittsburg — now containing theUlkeand Ham- 

 ilton collections — for affording me every facility for studying the 

 collections under their charge. 



Through the kind offices of Mr. Henry Wenzel and Dr. Skinner 

 the entire Horn collection, excepting the few types and uniques, has 

 been sent to me for study, and Mr. Fuchs has rendered the same 

 service with the collection of the California Academy of Sciences. 

 Of the native material studied, the Hubbard and Schwarz collection 

 is, as usual, by far the richest in both specimens and species, and, as 

 on previous occasions, this wealth of material has been turned over 



