We claim the ornamental design for a portion of a sports helmet, as shown and described.
FIG. 1 is a left side elevational view of a portion of a sports helmet;
FIG. 2 is a right side elevational view of the portion of a sports helmet of FIG. 1; and,
FIG. 3 is a rear elevational view of the portion of a sports helmet of FIG. 1.
The broken (dashed) lines shown in FIGS. 1 through 3 are included for the purpose of illustrating environmental elements only and form no part of the claimed design. The short and long dashed lines seen in FIGS. 1, 2, and 3 represent boundary lines and form no part of the claimed design.