Introduction 
viii 
when published in the proceedings of local natural history societies, refer- 
ences to species of economic importance when published in scientific 
agricultural journals, references to vectors of plant diseases when pub- 
lished in phytopathological journals, and many other references of a 
similar nature. It will be very much appreciated if authors will send me 
reprints of all articles dealing with the Homoptera Auchenorhyncha so 
that this material may be included in future catalogues to make them as 
complete as possible. Also it would seem to the author 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 November 1, 1954 has been 
included in this catalogue. 
Z. P. Metcalf 
Raleigh, North Carolina 
December 1954 
