Primary homonyms of species have been replaced by nomina 

 nova; secondary homonyms have been restored to their original 

 names if the homonymy 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 sugges- 

 tions 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 limi- 

 tations are outweighed by the advantages. We are confronted by so 

 many coined words that can have no gender that it seems better 

 to use this system and disregard apparent violations of Latin and 

 Greek grammar. Where the gender of generic names can be deter- 

 mined, the appropriate adjustments are made in the specific names. 



In a detailed catalogue such as this, it is practically impossible 

 to eliminate all errors. We will appreciate it very much if our 

 attention is directed to all such mistakes. It is especially easy 

 to overlook lists published in the proceedings of local natural 

 history societies, references to species of economic importance 

 published in scientific agricultural journals, references to vectors 

 of plant diseases published in phytopathological journals, and ref- 

 erences of a similar nature. It will be very much appreciated if 

 authors will send us reprints of all articles dealing with the 

 Homoptera. Also, it would seem that no changes in the nomencla- 

 ture adopted in this catalogue should be made in the future with- 

 out a full explanation. 



All literature available to the writer before December 31, 1955, 

 has been included in this catalogue. 



The present catalogue of the Family Cicadellidae is the seven- 

 teenth part of the Cicadelloidea. This was virtually complete at the 

 time of the death of Dr. Z. P. Metcalf on January 5, 1956. It was 

 completed with the aid of Miss Virginia Wade, research analyst, 

 North Carolina State University, who worked with Dr. Metcalf 

 for 7 years, and the technical advice of Dr. David A. Young, also of 

 North Carolina State University, and Dr. W. H. Anderson, Insect 

 Identification and Parasite Introduction Research Branch, Ento- 

 mology Research Division, U. S. Department of Agriculture, Belts- 

 ville, Md. Miss Emily Bennett, formerly Librarian of the Division 

 of Insects, U. S. National Museum, was extremely helpful in locat- 

 ing certain references needed for the catalogue. 



In this part of the catalogue a method of literature citation has 

 been adopted which differs from that used in the catalogues of 

 the fulgoroid families. References are cited by author, year, and 

 key letter, e.g., Fabricius 1802a. The full reference can be obtained 

 by consulting the Bibliography of the Cicadelloidea, in which 

 authors are arranged alphabetically, and their works chronologi- 



