Andricus deciduatus

Quercus bicolor
Bud galls
Almost globular, 4 mm in dia., developed usually from a weak lateral bud, in September.

[Photo caption]
On Quercus bicolor. Galls drop in September. Adults emerged Mar 20 the second spring and Apr 10 the third spring (IL). An adult, det as this sp. was taken ovipositing in bud of Q alba on Apr 7 (DC).

Andricus deciduatus, new species

Host.--Quercus bicolor

Gall.--A small ellipsoidal deciduous bud gall on small twigs in the fall. Greenish-gray with longitudinal purple streaks, the surface pebbled under lens, 4.5 mm long by 4 mm in diameter, slightly pointed at apex with a heart-shaped base when detached in which is a round impressed scar. They are found in September, produced usually from one of the small lateral buds near the base of the current season's growth but sometimes occur as far bask as on five-year old wood, very rarely from a small bud in the terminal cluster on a weak branch. About the end of September they drop to the ground and the thin fleshy layer decays leaving a longitudinally ribbed hard thin-walled shell with a large larval cavity.

Habitat.--IL

Opened some of the galls September 3, 1918, and found living adults and left the rest to emerge naturally, which they did by April 10, 1919.