VI 
Introduction 
calling attention to the mistakes authors have made but to make certain 
that students following the catalogue have a clear understanding of what 
is implied. 
The determination of obvious typographical errors is not always easy. 
These errors range all the way from clearly apparent transpositions of 
letters, to misspelled names of individuals, geographical names, and many 
others of like character. However, so many generic names have been formed 
by the transposition and substitution of letters that one is often at a loss 
to know which names are misspelled and which are not. For example, 
Neokolla and Keonolla, or Alehra, Elabra, and Eualebra. 
All variations in spelling save those which refer to endings only, are 
appropriately cross-referred. The species have also been listed under every 
known generic combination so that it is possible to find any species Avith- 
out recourse to the index, which will be published at the completion of the 
Fascicle. 
The writer takes no pride in the authorship of nomina nova. He uses 
them only Avhen he thinks they are necessary. No new names are proposed 
for species or genera described by living authors without first giving the 
original author an opportunity to correct primary or secondary homo¬ 
nyms. 
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 believed 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 
attention 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. 
In the present number of this series we have departed from our previous 
method used in some of the earlier numbers of giving latinized names to 
varieties which in the past have been designated by Arabic letters, Greek 
letters, numbers, or other designations. All varieties are catalogued, how¬ 
ever, under the first designation regardless of its form. Some of these varie¬ 
ties may prove to be valid species with further study and then may be 
given latinized designations. 
Primary homonyms of species have been replaced by nomina nova; sec¬ 
ondary homonyms have been restored to their original names if the ho¬ 
monymy has been relieved by moving one or the other or both species to 
other genera. 
