In 1957, some officers of the Forest Insect Survey of Canada discovered a species of Nepticula mining the leaves of white birch (Betula papyrifera Marsh.) and yellow birch (Betula lutea Michx. f.) in Ontario. At that time the species was considered to be undescribed, but to confirm this it was necessary to study the life-history. This has been done by Mr. O. H. Lindquist, Forest Insect Laboratory, Sault Ste. Marie, Ontario, and the results of his studies are being presented in a companion paper. His investigations confirmed that the species had not been named and the following description is presented.
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