INTRODUCTION 
In the autumn of 1913 Dr. McDunnough visited Europe with a 
large collection of North American Lepidoptera for the purpose of 
comparing this material with the numerous types existant in the various 
European museums. The result of his visit to M. Charles Oberthur 
at Rennes has already been given to entomologists in Vol. IX of the 
“Etudes de Lépidoptérologie Comparée” published by Mr. Oberthur, 
in which a large number of Boisduval’s types of Diurnals are figured; 
unfortunately Mr. Oberthur’s time was very limited and no work 
could be done on the Noctuidae or Geometridae in his collection. 
In the National Museum at Paris Ragonot’s types and the few remain- 
ing types of Guenée were examined; in Berlin a few of Zeller’s oldest 
types and some of Moeschler’s were discovered ; the bulk of the work 
was done in the British Museum at London, where a month was spent 
in carefully going over Walker’s, Grote’s, and Zeller’s types, with the 
exception of the Tortricids and Tineids. In all the above museums 
every facility for work was afforded us, and we wish here to express 
our thanks to the various curators and members of the museum staff 
who combined to make our stay in Europe so pleasant and profitable. 
The following notes give the main results of our comparisons; in 
the Noctuidae, thanks to the efforts of Sir Geo. Hampson and Mr. 
Wolley Dod, comparatively few mix-ups were noted; in several groups 
of Geometridae, viz., those not yet revised by Mr. Prout, great dis- 
crepancies were evident and some time must elapse before we can 
hope for anything like stability of nomenclature in this group; the 
Pyralids, with the exception of some few small groups, showed a dis- 
tinct improvement over the Geometridae. 
