2 
Psyche 
[March 
a row after the first labelled specimen; undoubtedly some 
specimens which are not actually types were put in these 
series at the same time or subsequently, either by Hagen 
himself or inadvertantly by others. In selecting lectotypes 
of Hagen’s species the specimen labelled by Hagen has been 
taken in each case. Lectotypes have been designated for all 
the species from North America described by Hagen unless 
they have been previously set in literature, even if only rep- 
resented in the collection by a single individual. This is 
done because of the possibility of specimens appearing in 
other collections which might erroneously be considered as 
types. 
There is a possibility that some specimens designated as 
lectoallotypes have not been correctly associated with the 
lectotypes, that is, do not represent the opposite sex of the 
same species as the lectotypes. In a very high proportion of 
the North American caddis fly species it is impossible, with 
our present studies, to separate the females of closely re- 
lated forms, so that we have to rely to an inordinate extent 
on collection, data as a basis for association. 
All the specimens mentioned as “allotype” represent des- 
ignations made for the first time in this paper. 
In the Banks collection the specimens listed without de- 
finite collector from the eastern states were taken by Banks 
himself, except in a few cases. 
Banks’ species have his own label on the first specimen and 
simply a “TYPE” label on the others. The first specimen 
with the label has been taken as the lectotype, a procedure 
which Mr. Banks has requested and which seems perfectly 
logical. 
In rare cases when these first specimens have been females 
and the cotype series contained males, an exception to the 
foregoing procedure has been instituted and a male selected 
as the lectotype. 
No attempt has been made to analyze any of the cotype 
series except the lectotypes, the remainder automatically 
becoming paratypes. Such a study would have little signifi- 
cance since the paratypes will have only historic and minor 
taxonomic interest. Furthermore so many of the specimens 
have been sent in exchanges, etc., to institutions in widely 
