Xili. 
INTRODUCTION. 
The fourth annual report of the Entomologist of the 
State Experiment Station of the University of Minnesota, 
respectfully submitted to His Excellency, Governor D. M. 
Clough, contains an account of all Butterflies and Moths 
found in Minnesota which are destructive in their earlier 
states to our fruit-bearing trees, shrubs and canes, and 
which frequently cause considerable losses to our fruit grow- 
ers. As orchards are now established in many parts of the 
state, and as the insects destructive to the plants are not as 
well known to our horticulturists as in the older settled 
regions of the United States, where horticulture as a busi- 
ness has been carried on for many years, a report describing 
and illustrating these insects, and giving the best remedies 
to prevent their injurious influence, is much needed. It is, 
however, impossible to describe all the numerous and de- 
structive insects found in our orchards in one single report, 
and for this reason only the very important order of Lepi- 
doptera is described in the following pages. 
It would have been perhaps best to have the insects de- 
scribed in this report arranged according to their food- 
plants, but to make it also useful to students of our public 
schools, etc., the insects are arranged according to the classi- 
fication of Lepidoptera usually adopted, and the different 
families have been described in a few words. 
There remains for the Entomologist the pleasant duty 
of expressing his sincere thanks to all persons that have 
aided him in many ways in his work. Especial thanks are 
due to the different newspapers, who with unfailing courtesy 
published all articles written for the instruction of the 
farmers in regions infested by injurious insects. The Chicago, 
