VI 
INTRODUCTION 
lished in phytopathological journals, and many other 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 changes in the nomenclature adopted in this catalogue should not 
be made in the future without a full explanation. 
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. This change has been instituted to save time, space, and publi- 
cation costs. It is believed that the revised method of literature citation 
will cause no great inconvenience to the reader. Dr. Metcalf himself ad- 
vocated it under certain conditions in the past, and it is felt that the use 
of abbreviated literature citations would have met with his approval 
for his catalogues. 
Under the abbreviated system used here the literature 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 Mem- 
bracoidea and Fossil Homoptera in which authors are arranged alpha- 
betically, and their works chronologically under the author’s name. This 
method of citation eliminates the necessity for a complete literature cita- 
tion in the catalogue proper. 
Z. P. Metcalf 
and 
Virginia Wade 
Raleigh, North Carolina 
November 1964 
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