Fundatrices feed as larvae near the edges on the upper sides of young leaves, which edges turn upward and fold over the insect. These folded marginal pseudogalls develop thickened, stiff walls, and usually turn red. In Berkeley, fundatrices were mature on April 1, and began producing young a few days later. In late autumn, I found colonies only on the undersides of leaves, more or less exposed, and only on evergreen oaks, with very few oviparae ... Swain (1919) recorded colonies from both the upper and undersides of leaves in summer, this has also been recorded for other Stegophylla species.

Pages 46-47, Figure 47