2 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



the figure of 1,767 as the approximate number of species now recog- 

 nized. These figures, collated with similar categories in Lethierry 

 and Severin (1896), show that there has been an increase of many 

 genera and hundreds of species of Tingidae during the past three- 

 quarters of a century. And as attested by the number of new forms 

 being described each year in technical publications, there are still 

 many unknown genera and many more new species yet to be dis- 

 covered. 



The three subfamilies of the Tingidae are listed in alphabetic 

 sequence. The genera and subgenera (including synonyms, homo- 

 nyms, emendations, misapplied names, misspellings, nomina nuda 

 (sine species), lapsus calami, and errata) are also alphabetized under 

 their respective subfamilies. Although absolute completeness and 

 perfection are unattainable, every effort has been taken to formulate 

 a complete registery of all generic and subgeneric names, both 

 valid and invalid, heretofore proposed in the literature for both 

 existing and fossil tingids. Each reference has been checked against 

 the original publication. Thus, a number of errors that have crept 

 into the literature have been rectified. 



The authors hope that the users of this work will make known 

 typographical, technical, and other errors so that corrections may 

 be made in the catalog of the Tingidae of the world, now in 

 preparation. 



Often it has been difficult to accredit with any degree of certainty 

 the first authority accountable for synonymy, subsequent type desig- 

 nation of a genus, and other taxonomic changes. When such in- 

 formation was not so expressed in the literature, the oldest ascertain- 

 able record of the action has been cited as the authoritative citation. 



Accepted or valid generic and subgeneric names are printed in 

 boldface type; the invalid or inacceptable names are in lightface 

 type. Cross-references are provided to link every synonym, homo- 

 nym, emendation, unaccepted name, and error of any type to the 

 proper taxon. 



The name of each genus, subgenus, and type species is followed by 

 the name of author with date and page reference, thus providing 

 identification in the list of literature cited. "Later citation" as used 

 herein refers to authors who have correctly cited the type species after 

 its fixation; a "previous selection" is a citation made prior to the 

 official list of the International Commission on Zoological Nomen- 

 clature but is in agreement with that list; "erroneous or invalid 

 citations" are explained under the respective genera. 



In searching for new generic records and other taxonomic changes, 

 the reader should begin with volume 93 of the Zoological Record 

 (1956). 



