PREFACE. 



Since the pu1)]ication of the first edition of this work,* which 

 ended with the CeranibycidiB, no attempt has been made to com- 

 plete the work. Tlie classification of the remaining families of 

 the so-called "Pseudotetramera" was very far from being in such 

 a form as to be presented advantageously in an elementary work. 



But within the last twenty years, not only have our collections 

 been largely increased, but many genera previously unknown to 

 our feuna have been detected, and perhaps a still larger number 

 of new genera have been added. 



Apart from a small number of general monographs published 

 in Europe, f the additions have been made by re-studies of various 

 families and groups by us with increased material ; and by 

 memoirs on local fauna) as of Florida and Michigan: in which 

 tl)e co-operation of Messrs. H. G Hubbard and E. A. Scliwarz 

 greatly lessened the lal)or. Similar memoirs on the local fauna' 

 of Texas and California are in preparation, and will be hastened 

 to completion as soon as time will permit. 



The great series of llhynchophora has been isolated from the 

 other Coleoptera, and a monograph of our species i)ul)lislied In- 

 ns;! ^I'O'ii tl'is volume the classification of the genera of Khyn- 

 chophora of the present work has been condensed. 



A small number of genera, which could not be satisfactorily 

 l)laced in the progress of the sheets through the press, have been 



* Part I. 181)1-1862 (Smithsonian Scries, No. 136, Mis. Coll., vol. iii.) ; 

 I'art II. 1873 (Smithsonian Series, No. 205, Mis, Coll., vol. xl.). 



t E. g., Ewiiemidea DoBonvouloir ; Di/tiscidw Sliarp, Trirho])ier;j()i(l(t'. 

 Matthews, etc. 



X Pi'oc. American Pliilos. Soc, xv. 187G. 



(iii) 



