2 GENERAL CATALOGUE OF THE HOMOPTERA 



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 are 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 inter- 

 preted 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 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 mis- 

 spelled names of individuals, geographical locations, et cetera. So 

 many generic names have been formed by the transposition and sub- 

 stitution 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, 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 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- 



