Cecidomyia ulmii sp. nov.

Gall.--This is made by folding and growing together of the small, immature, terminal leaves or leaf-buds of the American elm (Ulmus americana), causing them to swell into galls.

Habitat: NY

The gall may be found during June and July. The imago emerges during the same months.

Janetiella ulmii Beutm ["Dasyneura ulmea" is listed causing the same symptom]

Hosts: Ulmus

Blasted buds, immature leaf clusters, or swollen seeds or slippery elm midge, spring. PI. 11 (6)

Janetiella ulmii leaf galls are commonly found on elm leaves throughout Allegheny County."