IV INTRODUCTION 



where the matter has been reprinted under a different title with 

 different pagination, separate references are given. Authentic edi- 

 tions republished have been entered as separate references. Genera 

 established without included species have been dated from their 

 original description, with their type fixation dated at the earliest time 

 the action can logically be interpreted to have occurred. 



Original spellings have been retained in all cases, except obvious 

 typographical errors. Typographical errors are indicated by placing 

 "[sic]" after the misspelled name. This is not for the purpose of 

 calling attention to the mistakes, but to make certain that students 

 following the catalogue have a clear understanding of what is implied. 



The determination of typographical errors is not always easy. 

 These errors range from clearly apparent transpositions of letters 

 to misspelled names of individuals, geographical locations, et cetera. 

 So many generic names have been formed by the transposition and 

 substitution of letters that one is often at a loss to know which names 

 are misspelled and which are not; for example, Neokolla and Keonolla, 

 or Alebra, Elabra, and Eualebra. 



All variations in spelling, save those which refer to endings only, 

 are appropriately cross-referred. The species have also been listed 

 under every known generic combination, so that it is possible to find 

 any species without recourse to the index, which will be published 

 at the completion of the Fascicle. 



The writer takes no pride in the authorship of nomina nova. He 

 uses them only when he thinks they are necessary. No new names 

 are proposed for species or genera described by living authors without 

 first giving the original author an opportunity to correct primary or 

 secondary homonyms. 



A catalogue is not a revision of a group. The location of the genera 

 and species in the present catalogue is merely an attempt to reflect 

 what is believed to be the general consensus of the best authorities 

 at the present time. Doubtful genera and species have been included 

 to call them to the attention of subsequent revisers. 



An attempt has been made throughout this catalogue to interpret 

 all references in the light of the period in which they were published. 

 This is not always easy and leads perhaps to erroneous conclusions 

 at times, but it is certainly much sounder from the standpoint of 

 nomenclature than the tendency to evaluate references from previous 

 decades in the light of present-day practices and procedures. 



In this series we have departed from our previous method of giving 

 latinized names to varieties which in the past have been designated 

 by Arabic letters, Greek letters, numbers, or other designations. 

 All varieties are catalogued, however, under the first designation, 

 regardless of its form. Some of these varieties may prove to be 

 valid species with further study and then may be given latinized 

 designations. 



