CICADELLOIDEA — HECALIDAE 6 



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Primary homonyms of species have been replaced by noinina nova; 

 secondary homonyms have been restored to their original names if the 

 homonymy has been relieved by moving one or the other, or both spe- 

 cies, to other genera. 



AH 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 out- 

 weighed by the advantages of this system. 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. Wliere 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 atten- 

 tion 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 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 Hecalidae is the ninth 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,, N.C. State 

 College, who worked with Dr. Metcalf for seven years, and the tech- 

 nical advice of Dr. David A. Young, jST.C. State College, and Dr. 

 W. H. Anderson, Insect Identification and Parasite Introduction 

 Laboratories, U.S. Department of Agriculture, Beltsville, Md. Miss 

 Emily Bennett, Librarian of the Division of Insects, U.S. National 

 Museum, has been extremely helpful in locating certain references 

 needed for the catalogue. 



The higher categories utilized in this classification are those decided 

 upon by Dr. Metcalf during his work on the catalogue. 



In this part of the catalogue a method of citing literature has been 

 adopted which differs from that used in the catalogues of the f ulgoroid 

 families. Eeferences are cited by author, year, and key letter, e.g., 

 Fabricius 1802a. The full reference can be obtained by consulting the 



