PREFACE. ix 



particular group has been since published, it was thought useful to 

 call attention to the fact in a marginal note. In cases of special 

 interest, a few species, published during 1852, have been added. 



Being intended for a reference, rather than for a synonymical cata- 

 logue, some species have been allowed to stand in distinct genera, to 

 facilitate research ; and for the same reason, the additions have mostly 

 been allowed to remain in the genera where they stand in the original 

 description. 



With regard to the scientific arrangement, in some of the groups 

 the original test has been remodelled from more recent materials; 

 but from want of time, and a sufficient familiarity with the subject, 

 in other groups (as the Buprestida?) the arrangement used by the 

 author has not been altered. 



Occasionally we have not altered the position of genera, as we be- 

 lieve improperly placed, because we did not wish to interfere with 

 those portions in which the author followed the arrangement given 

 by Westwood in the Synopsis, at the end of his Modern Classification, 

 of Insects. 



In a few instances, later names are placed as having authority over 

 earlier ones, the opinions of the author not being in accordance with 

 ours upon this point. 



It may be proper to remark, that the introduction of Mexican 

 species (as Meyaderus Ltfasciatus and Cebrio fcmoralis) was not with 

 a view of swelling the Catalogue by the addition of interesting spe- 

 cies to our fauna, but because such species were collected in Texas 

 by Lieut. Haldeman. 



S. S. H. 

 J. L. Le C.] 



