Introduction 
viii 
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 local lists when published 
in the proceedings of local natural history societies, references to species of 
economic importance when published in scientific 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 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. 
All literature available to the writer before December 31, 1955 has been 
included in this catalogue. 
Z. P. Metcalf 
AND 
Clyde F. Smith 
Raleigh, North Carolina 
August 1956 
