The empty or full cases of this moth are fairly common on trees throughout the country. The case, which is 2–3 in. in length when completed, is constructed by the caterpillar of a moth and is composed of a tough skin of silk in which is incorporated plant debris. The case is the permanent home of the developing caterpillar and of the adult female. The latter is a wingless moth while the male is fully winged and does not live in a case in the adult stage. But the caterpillar transports the case to the leaves upon which it feeds at night. During the day the case is sealed and affixed very firmly to a branch of the tree. Common host plants are macrocarpa and albizzia.
by Roy Alexander Harrison, D.SC., Senior Lecturer in Agricultural Zoology, Lincoln Agricultural College.