Abstract
The present paper is the result of a study of the food plant relationships of Exema Lac. and Arthrochlamys Ihering (Chlamys Knoch) in Canada. The study has shown that the species have strong monophagous tendencies, and that a knowledge of food plants is the key to an understanding of those which have been confused under the names Chlamys gibbosa and C. plicata.

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