2 GENERAL CATALOGUE OF THE HOMOPTERA 



numbers of the original. In a few cases where the matter has been 

 reprinted under a different title with different pagination, separate 

 references are given. Authentic editions that have been republished 

 have been cited 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 transposition of letters, to 

 misspelled names of individuals, geographical names, 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, NeokoUa and KeonoUa, 

 or Alebra, Elahra, and Eualehra. 



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 and 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 nomen- 

 clature 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 that in the past have been designated by 

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

 varieties are catalogued, however, under the first designation, regard- 



