I claim the ornamental design for an insect trap, as shown and described.
FIG. 1 is a top perspective view of the insect trap;
FIG. 2 is a bottom perspective view of the insect trap;
FIG. 3 is a front elevational view of the insect trap which is the same as a back elevational view;
FIG. 4 is a left side elevational view of the insect trap which is the same as a right side elevational view;
FIG. 5 is a top plan view of the insect trap; and,
FIG. 6 is a bottom plan view of the insect trap.
The broken lines in the drawings illustrate optional portions that do not form an essential part of the claimed design. While the drawings illustrate one or more example embodiments, it should be understood that according to other example embodiments that should be considered to be within the scope of the present disclosure, it is contemplated that any illustrated solid lines (or portions thereof) can be converted to broken lines and that any illustrated broken lines (or portions thereof) can be converted to solid lines to claim or disclaim portions, components, or sub-components of the designs shown. It is further contemplated that shading can be added or removed to claim or disclaim the corresponding surfaces.