without included species have been dated from their original 

 description, with their type fixation dated at the earhest 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 plac- 

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

 of calling attention to the mistakes authors have made but to make 

 certain that students following the catalogue have a clear under- 

 standing 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, etc. 

 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 pub- 

 lished 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 inter- 

 pret 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 refer- 

 ences 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 that in the past have been 

 designated by Arabic letters, Greek letters, numbers, or other 

 designations. All varieties are catalogued under the first designa- 

 tion, regardless of its form. Some of these varieties may prove to 

 be valid species with further study, and then may be given latin- 

 ized designations. 



IV 



