520 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 92 
eric and subgeneric names increased rapidly. Fifty-nine genera were 
established from 1800 to 1810 inclusive; 28 genera and 1 subgenus 
from 1811 to 1840, inclusive; 191 genera and 60 subgenera from 1841 
through 1899; and 281 genera and 103 subgenera from 1900 through 
1938. 
As is frequently true in an undertaking of this kind, the current 
interpretations of some well-known genera have been found to re- 
quire modification. An attempt has been made to adhere strictly to 
the rules and opinions of the International Commission on Zoological 
Nomenclature, and reference is made to the rules or opinions on which 
the conclusions are based in the discussions under some of the genera. 
Recently some proposals for the suspension of the Rules of Nomen- 
clature with reference to generic names in the bees have been sub- 
mitted to the International Commission, and these are also mentioned 
under the names which would be affected. However, such proposals 
cannot be accepted until opinions on them have been rendered and 
published. 
The names of Jurine’s genera that appeared in the “Erlangen 
List” * have recently been invalidated by Opinion 135 of the Inter- 
national Commission. The genotype designations of Latreille (1810) 
are considered valid by the International Commission (Opinion 11). 
Megachile, Centris, and Anthophora, however, were cited by Latreille 
with more than one species included under each and consequently 
cannot be regarded as having received type fixation in that publica- 
tion (Opinion 36). 
The necessity for a definite genotype designation for each genus or 
subgenus has been accepted by most systematic entomologists, and at_ 
its meeting in Budapest in 1927 the International Zoological Con-_ 
gress passed an amendment to Article 25 (law of priority) according 
to which a genus proposed after December 31, 1930, without a definite 
unambiguous designation of the type species, is to be considered as 
invalid under the Rules. Fortunately only a few names in the list that 
follows are affected by this ruling. 
The terminology used in the present list is essentially that contained 
in Article 30 of the International Rules with the following excep- 
tions: Monobasie is here used instead of monotypic, and tsogenotypic 
is used in reference to two or more genera that have the same species 
as genotype. 
The original work covered by each citation has been consulted, unless 
a statement to the contrary follows the reference. The dates of pub- 
lication given by Sherborn in his Index Animalium have been used 
for most of the names published before 1850. These, in most in- 
3 Erlangen Litteratur-Zeitung, vol. 1, p. 164, 1801. 
