The ornamental design for an electronicmouse, as shown and described.
FIG. 1 is a front perspective view of an electronic mouse showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a right side view thereof; and,
FIG. 5 is a left side view thereof.
The broken line showing of various regions and the unshaded areas there within are for illustrative purposes and form no part of the claimed design. The stippled shading represents a contrasting appearance of the interior of the scroll wheel as compared to the rim of the scroll wheel.