The ornamental design for an adulttricycle, as shown and described.
FIG. 1 is a perspective view showing my new design for an adult tricycle.
FIG. 2 is a right side elevational view thereof, the left side elevational view being substantially a mirror image thereof, the only difference being the position of the pedals.
FIG. 3 is a front elevational view thereof.
FIG. 4 is a rear elevational view thereof.
FIG. 5 is a top plan view thereof.
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a detail perspective view thereof.
The portions of the adult tricycle shown in broken lines form no part of the claimed design.