The ornamental design for a catchplate for a corn head assembly, as shown and described.
FIG. 1 is a top plan view of a catch plate for a corn head assembly in accordance with the new design;
FIG. 2 is an enlarged right side elevation view thereof, the left side elevation view being a mirror image thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front view thereof; and,
FIG. 5 is a rear view thereof.
The broken lines in FIGS. 1, 2, 4 and 5, illustrate portions of the catch plate and corn head assembly for purposes of illustrating environmental structure only and form no part of the claimed design.