Dicrodiplosis helena Felt

The midge was reared from subglobular galls on the underside of Aspen leaves, Populus tremuloides, collected by Miss Cora H. Clarke at Magnolia, Mass. It is by no means certain that in this species we have the gall maker.

Dicrodiplosis helena, new species

Gall. — Length 3 mm., subglobular, whitish, on the under surface of the leaf, opening on the upper surface.

This species was reared April 5, 1912, from subglobular galls on the under side of aspen leaves, Populus tremuloides, collected by Miss Cora H. Clarke at Magnolia, Mass., the preceding August. It is easily separated from the allied D. californica by the shorter distal enlargement and the decidedly longer distal stem of the fifth antennal segment. It is also quite different from D. populi reared earlier from a similar gall. We are not certain that this is the maker of the gall.

Harmandia helena

Host: Populus tremuloides

Harmandia galls are monothalamous and yellow, green, or reddish. In late spring or summer full-grown larvae drop to the ground to overwinter. Various other cecidomyiids have also been reared from these galls. These include a Clinodiplosis sp., Mycodiplosis thoracica, and Rhizomyia absobrina, all presumably mycophages.

This species was taken from a globular gall reportedly on the underside of the leaf.

Range: MA