VI 
Introduction 
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 Alebra, Elebra, 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 with- 
out recourse to the index, which will be published at the completion of the 
Fascicle, together with the full bibliography. 
The writer takes no pride in the authorship of nomen nova. He uses 
them only when he thinks they are necessary. Xo 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 homonyms. 
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 
present day practices and procedures. 
In the present number of this series we have departed from our previous 
method of giving latinized names to varieties which in the past have been 
designated by Arabic letters, Greek letters, numbers, or other designa- 
tions. All varieties are catalogued, however, under the first designation 
regardless of its form. Some of these varieties may prove to be valid species 
with further study and then may be given latinized designations. 
Primary homonyms of species have been replaced by nomen nova; 
secondary homonyms have been restored to their original names if the 
homonym has been relieved by moving one or the other or both species 
to other genera. 
All specific endings have been modified to agree with the suggestions 
made by Blackwelder 1940, Journal of the Washington Academy of Sciences 
31 : 135-140. There are certain disadvantages inherent in this method, but 
it seems to the writer that these limitations are outweighed by the ad- 
vantages of this system. We are confronted by so many coined words that 
