The ornamental design for an airmattress for a tent, as shown and described.
FIG. 1 is a perspective view of an air mattress for a tent showing my new
design therefor. The broken lines depicting a tent are for illustrative
purposes only and form no part of my invention;
FIG. 2 is a top plan view showing the design an air mattress for a tent
with the inflation nipple in an extended position;
FIG. 3 is a right side elevational view; the left side being a mirror image
thereof;
FIG. 4 is a front elevational view showing design of the air mattress for a
tent with the inflation nipple in a retracted position; the rear view
being a mirror image thereof; and,