The ornamental design for a structuralmember for modelrobots, as shown and described.
FIG. 1 is a perspective view of a structural member showing our new design, the broken lines illustrating environmental structure are for illustrative purposes only and form no part of the claimed design;
FIG. 2 is a side elevational view thereof, the opposite side being a mirror image thereof, the broken lines illustrating environmental structure are for illustrative purposes only and form no part of the claimed design;
FIG. 3 is an end view thereof, the opposite end being a mirror image thereof; the broken lines illustrating environmental structure are for illustrative purposes only and form no part of the claimed design;
FIG. 4 is a top plan view thereof, the broken lines illustrating environmental structure are for illustrative purposes only and form no part of the claimed design; and,
FIG. 5 is a bottom view thereof, the broken lines illustrating environmental structure are for illustrative purposes only and form no part of the claimed design.