Introduction 
Vll 
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. 
Primary homonyms of species have been replaced by nomen nova ; 
secondary homonyms have been restored to their original names if the 
homonym has been relieved by moving one or the other or both species 
to other genera. 
All specific endings have been modified to agree with the suggestions 
made by Blackwelder 1940, Journal of the Washington Academy of 
Sciences 31: 135-140. There are certain disadvantages inherent in this 
method, but it seems to the writer that these limitations are outweighed 
by the advantages of this system. We are confronted by so many coined 
words that can have no sex that it seems better to use this system and 
disregard apparent violations of Latin and Greek grammar. Where the 
sex of generic names can be determined the appropriate adjustments are 
made in the specific names. 
In a detailed catalogue such as this it is practically impossible to elim¬ 
inate all errors. The author will appreciate it very much if his attention is 
directed to all such mistakes. It is especially easy to overlook local lists 
when published in the proceedings of local natural history societies, 
references to species of economic importance when published in scien¬ 
tific agricultural journals, references to vectors of plant diseases when 
published in phytopathological journals, and many other references of a 
similar nature. It will be very much appreciated if authors will send me 
reprints of all articles dealing with the Homoptera Auchenorhyncha 
so that this material may be included in future catalogues to make them 
as complete as possible. Also it would seem to the author that changes in 
the nomenclature adopted in this catalogue should not be made in the 
future without a full explanation. 
All literature available to the writer before July 1, 1954 has been in¬ 
cluded in this catalogue. 
Z. P. Metcalf 
Raleigh, North Carolina 
July 1954 
