6 
Introduction 
better known than the journals, for example, Van Duzee 1917 Catalogue 
of Hemiptera of America North of Mexico not Techn. Bull. California Agr. 
Exp. Sta. Ent. 2. If the journal has been published in series the abbreviation 
of the journal is followed by a series number or by such an abbreviation as 
n. s. (new series), o. s. (old series), n. f. (neue Folge), or the like. This is 
followed by a note indicating the nature of the reference. 
The notes which follow the references are generally self explanatory, but 
three points may be mentioned here. Such notations as “[described],” 
“[notes],” “[key],” and the like are intended to be suggestive rather than 
precise or exclusive. The notation “[error]” means not accepted in this 
catalogue. Usually the latest published synonymy is accepted, but not al- 
ways. The other notation “[comparative note]” is used to designate those 
references, often of the greatest taxonomic significance, in which two ge- 
neric, specific or other groups are compared. All references have been checked 
against the original save those marked with an asterisk (*), w T hich have 
been accepted from reliable sources. Every effort has been made to have the 
references full and complete and to give an indication of the character of the 
data contained. Where the writer knows that reprints have been issued with 
different pagination, this is indicated in parenthesis following the page num- 
bers of the original. In a few cases, where the matter has been reprinted un- 
der a different title with different pagination, separate references are given. 
Where authentic editions have been published these have been indicated by 
separate references. Genera established without included species have been 
dated from their original description, with their type fixation dated at the 
time of the first inclusion of species. Original spellings have been retained 
in all cases, except obvious typographical errors. Typographical errors are 
indicated by placing “[sic]” after the misspelled name. All typographical 
errors, save those which refer to endings only, are appropriately cross- 
referred. The species have also been listed under every known combination 
so that it is possible to find any species without recourse to the index, which 
will be published at the completion of the Fascicle, together with the full 
bibliography. 
A catalogue is not a revision of a group and the location of the genera and 
species in the present catalogue is merely an attempt to reflect what is be- 
lieved to be the general consensus of the best authorities at the present time. 
Doubtful genera and species have been included to call them to the atten- 
tion of subsequent revisers. 
An attempt has been made throughout this catalogue to interpret all 
references in the light of the period in which they were published. This is 
not always easy and leads perhaps to erroneous conclusions at times, but it 
is certainly much sounder from the standpoint of nomenclature than the 
tendency to evaluate references from previous decades in the light of pres- 
ent day practices and procedures. 
