Sambucus (elder)
...
Tapered stem swelling...Neolasioptera pierrei (Gagné)

Swellings vary in size depending on the number of larvae within. Larvae overwinter in the stem, and adults emerge in spring. Host: S. canadensis. Distr.: Massachusetts and New York.

Lasioptera sambuci

Cecidomyia sambuci

This species was heretofore known from the larva and gall only, and the adult is here described for the first time. The gall is an irregular gnarly swelling on one side of the stem of the elder (Sambucus canadensis). The larvae overwinter and transform in the gall, and the adults emerge the following May and June. The gall is very common in the vicinity of New York.

Neolasioptera sambuci

Sambucus

Irregular stem gall, length 1/10 to 1/7 inch, midge, summer

From stem gall on Sambucus canadensis.