The Broad-leaved Aster (Aster macrophyllus, L.) grows in patches of considerable size in the woods around Levis. In the month of June, 1902, I noticed that many of the large ground leaves of the plant were folded over from both sides and crinckled. On opening one of them I found that a larva had truned the leaf into a cool and pleasant tent for itself, and was feeding upon the parenchyma of the leaf.