INSECTS INJURIOUS IN 1902. 25 
at McIntosh, and 20 cents at Twin Valley where they claimed to 
have no cheap grade. 
I take pleasure in acknowledging helpful co-operation upon 
the part of Mr. Sawyer at Perham, Mr. Remi Fortier at Gentilly, 
Mr. McCarty at McIntosh and Mr, E. L. Tomtengen at I*ossum, 
Fig. 21.—A Robber-Fly destroying a Grasshopper, enlarged. Original. 
county commissioners, who assisted me in my work at these vari- 
ous points. 
Figs. 18, 19, and 20, show differences in details of structure 
of the abdomens of male specimens of the Rocky Mountain Locust, 
Lesser Migratory Locust, and the Red-legged Locust which help 
to distinguish them. 
