Abstract
Arthrochlamys bebbianae Brown is a small chrysomelid that occurs rather commonly in the Ottawa District. It is one of a group of species that have been confused under the names Chlamys gibbosa (Fab.) and C. plicata (Fab.). Both its larvae, which are case-bearers, and its adults feed on the leaves and on the epidermis of the new growth of a willow, Salix Bebbiana Sarg. The speries appears to be monophagous, and it tends to occur in diffuse colonies.

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