The ornamental design for the tail portion of an artificial fishing lure, as shown and described.
FIG. 1 is an elevation view of the tail portion of an artificial fishing lure incorporating my new design, wherein the phantom lines illustrate environment and form no part of the claimed design;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a right side elevation view thereof; and,