  In a sequence of papers in the early 1990's, Comins, Hassell, and May
investigated Nicholson-Baily dynamics in a spatial implementation with
diffusion. They delineated four types of dynamic behavior: crystalline
lattices, spatial chaos, spirals, and hard-to-start spirals. We revisit their
results with current computational methods, and develop a sampling technique to
estimate the Lyapunov spectrum. We find that spatial chaos, spirals, and
hard-to-start spirals are not separate categories, but part of a spectrum of
behavior. We more thoroughly investigate the crystalline structures. We show
that the Lyapunov sampling method can be used to find bifurcation curves in
parameter space, and demonstrate an interesting spatial chimera.
