 They eventually diverged into two distinct ecotypes with a more specialist host plant preference.One ecotype prefers to feed on "Adenostoma" while the other ecotype prefers to feed on "Ceanothus".The "Adenostoma" ecotype possesses a white dorsal stripe, an adaptation to blend in with the needle-like leaves of the plant, while the "Ceanothus" ecotype does not ("Ceanothus" spp.