The ornamental design for a pair of barbecuetongs, as shown and described.
FIG. 1 is a perspective view of a pair of barbecue tongs showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The dashed or broken lines shown in the drawings depict portions of the pair of barbecue tongs in which the design is embodied that form no part of the claimed design.