This species was reared in August 1906 from a terminal conical leaf gall on the whorled loosestrife, Lysimachia quadri- folia, taken at Albany, N. Y. A similar gall, possibly that of this species, was found on L. terrestris August 9, 1912, at Elm Lake in the Adirondacks. Eupelmus dryorhizoxeni Ashm. was reared from an axillary bud gall possibly produced by the same midge.

Gall. This is a conical enlargement of the terminal bud (pi. 9, fig. 2) and contains a number of yellowish larvae.

Bud-like, and composed of immature leaves drawn together. It is formed at the extreme summit of the plant. After the adult flies have emerged, the deformed leaves of the of the galled buds begin to expand.