The Collaborative International Dictionary of English v.0.48:

Rubric \Ru"bric\, Rubrical \Ru"bric*al\, a.
   1. Colored in, or marked with, red; placed in rubrics.
      [1913 Webster]

            What though my name stood rubric on the walls
            Or plaistered posts, with claps, in capitals?
                                                  --Pope.
      [1913 Webster]

   2. Of or pertaining to the rubric or rubrics. "Rubrical
      eccentricities." --C. Kingsley.
      [1913 Webster]