The ornamental design for artificial legs, as shown and described.
FIG. 1 is a front view of the artificial legs;
FIG. 2 is a top view of the artificial legs;
FIG. 3 is a bottom view of the artificial legs; and,
FIG. 4 is a left side view of the artificial legs, the right side view being a mirror image thereof.
The artificial legs of the Figures are artificial nymph legs or artificial fly legs which, in at least some embodiments, are useable as materials for fly dressing or fly tying.