INTRODUCTION 



In the second supplement to the Catalogue of Coleoptera of 

 America, north of Mexico, we record the species, subspecies, and 

 "aberrations," described during the period from January 1, 1925, 

 to December 31, 1930. xls in the catalogue and first supplement, 

 the new species are serially numbered, with subspecies and varieties 

 indicated by the addition of a letter to the serial number of the 

 species Avith which they are allied. An unusual number of names 

 have been proposed for so-called "aberrations;" these have not 

 been numbered, but are not necessarily synonyms. Many are recog- 

 nizable variations which, however, have been regarded by some 

 author or reviewer as of less than subspecific rank. 



By thus numbering the names which have been proposed we do 

 not intend to present our own opinion as to their validity, but to 

 reflect the opinions of the authors quoted. In a few instances, where 

 the opinions conflict, we have, as far as possible, presented both 

 views. 



In preparing this supplement w^e have used as a basis the data 

 assembled in Entomological News, and added thereto those found 

 in the Zoological Record and, in a few instances, others cited in 

 Biological Abstracts. The result was then compared with the 

 original papers, as published in various periodicals, here and abroad, 

 and in many instances, preliminary copy was sent to the authors 

 for correction. Finally comparison was made with the Junk 

 Coleopterorum Catalogus, which disclosed some differences which 

 have been noted, but not always followed. 



The original intention was to print the second supplement in 



1931. Financial difficulties having caused a postponement, we have 

 taken advantage thereof to carry the bibliography down to December, 



1932, and to indicate the new species, etc., proposed in 1931 and 1932, 

 as a third supplement. 



In the bibliography Ave have included all contributions bearing 

 directly or indirectly upon the classification of Coleoptera, as well 

 as a few papers of literary interest. The period covered by this 

 supplement has produced several papers of importance in clarifying 

 the classification. Bradley's Manual of the Genera brings together 

 in one volume, for the first time since 1883, definitions of nearly 

 all the genera. Jeannel's Monograph of Trechinae is an example of 

 able taxonomic work covering the species of the old and new^ world. 



