CICADELLOIDEA — IDIOCERIDAE 3 



less 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Primary homonyms of species have been replaced by nomina nova; 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 limitations are 

 outweighed by the advantages. We are confronted by so many 

 coined words that can have no gender it seems better to use this sys- 

 tem and disregard apparent violations of Latin and Greek grammar. 

 Where the gender 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 

 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, refer- 

 ences to species of economic importance published in scientific 

 agricultural journals, references to vectors of plant diseases published 

 in phytopathological journals, and references 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 nomenclature adopted in this catalogue should be 

 made in the future without 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 Idioceridae is the 16th part 

 of the Cicadelloidea. This was vh-tually 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, North Carolina State 

 University, and Dr. W. H. Anderson, Insect Identification and Parasite 

 Introduction Research Branch, Entomology Research Division, 

 Agricultural Research Service, U.S. Department of Agriculture, 

 Beltsville, Md. Miss Emily Bennett, formerly librarian of the 

 Division of Insects, U.S. National Museum, was extremely helpful 

 in locating 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 



