The exhibit of insects affecting forest and shade trees was prepared by E. P. Felt, D.Sc., New York State Entomologist, and was a small, though representative collection, designed to show the life, history and habits in particular of the more injurious forms of insects affecting shade and forest trees in New York State. A special effort was made to depict, so far as possible, the life, history, habits and methods of work of the forms possessing economic importance and to show whenever possible the natural enemies of value in keeping these species in control. This collection was arranged in a specially designed case having a series of three nearly horizontal trays thirty-seven and one-half inches by eighteen and one-half inches upon each side, and an elevated central portion bearing two nearly perpendicular ones upon each side, the middle being occupied by a glass case containing an attractive natural group. A brief account of the exhibit under appropriate heads is as follows: _Insect galls_. This collection, occupying two nearly perpendicular trays and representing the work of fifty-three species, was devoted to the peculiar and varied vegetable deformities produced by insects. These structures are always of great popular interest, and the insects causing the same present biologic problems of unusual attractiveness. _Forest insects_. The species affecting forest trees in particular were exhibited in three horizontal trays occupying one side of the case. This section was devoted principally to representing the biology and methods of work of this exceedingly important group. _Shade-tree insects_. Like that representing forest insects, the exhibit of shade-tree pests was very largely biologic. It occupied three horizontal trays and a nearly vertical one of the exhibit case, and was devoted to species which are destructive largely on account of their depredations upon shade trees. _Adirondack insects_. This was a small collection occupying one of the nearly perpendicular trays, and comprised over one hundred species. This portion of the exhibit represented the more characteristic forms occurring in the Adirondacks. _Natural group of forest insects_. This group occupied the central glass box and contained thirty-one species of insects or representations of their work upon wax models of their food plants, namely, white birch, red oak, elm and maple. Eleven species of beetles, fifteen of butterflies and moths, two of the bee family and three of the bug family were to be seen upon the plants or on the ground at their base. This group gave an excellent idea of the appearance of insects when amid their natural surroundings. COLORED PLATES